I establish the connection to Virtual Box locally using the command:

virsh -c vbox:///session

The connection is established successfully and allows me to execute some commands without problems.

But when I try to restore a snapshot of a virtual machine box using:

snapshot-revert WIN7x64_1 --current

or

snapshot-revert WIN7x64_1 --snapshotname "ORIGIN"

It always returns the following error message:

error: internal error: could not restore snapshot for domain WIN7x64_1

My libvirt version is:

Compiled against library: libvirt 4.0.0
Using library: libvirt 4.0.0
Using API: VBOX 4.0.0
Running hypervisor: VBOX 139913391.844.576

And VBoxManage version:

5.2.10_Ubuntur121806

I also add an extract from libvirt's logs, although in principle there is nothing worth mentioning beyond the error:

    2018-05-14 08:45:41.655+0000: 968: info : virEventPollDispatchHandles:506 : EVENT_POLL_DISPATCH_HANDLE: watch=18 events=1
2018-05-14 08:45:41.655+0000: 968: info : virEventPollUpdateHandle:152 : EVENT_POLL_UPDATE_HANDLE: watch=18 events=1
2018-05-14 08:45:41.655+0000: 968: debug : virEventPollInterruptLocked:722 : Skip interrupt, 1 139914317211200
2018-05-14 08:45:41.655+0000: 968: info : virEventPollUpdateTimeout:265 : EVENT_POLL_UPDATE_TIMEOUT: timer=10 frequency=5000
2018-05-14 08:45:41.655+0000: 968: debug : virEventPollUpdateTimeout:282 : Set timer freq=5000 expires=1526287546655
2018-05-14 08:45:41.655+0000: 968: debug : virEventPollInterruptLocked:722 : Skip interrupt, 1 139914317211200
2018-05-14 08:45:41.655+0000: 968: info : virObjectRef:388 : OBJECT_REF: obj=0x56512a5b9b40
2018-05-14 08:45:41.655+0000: 968: info : virObjectRef:388 : OBJECT_REF: obj=0x56512a571cf0
2018-05-14 08:45:41.655+0000: 968: info : virEventPollUpdateHandle:152 : EVENT_POLL_UPDATE_HANDLE: watch=18 events=1
2018-05-14 08:45:41.655+0000: 968: debug : virEventPollInterruptLocked:722 : Skip interrupt, 1 139914317211200
2018-05-14 08:45:41.655+0000: 968: debug : virEventPollCleanupTimeouts:525 : Cleanup 2
2018-05-14 08:45:41.655+0000: 968: debug : virEventPollCleanupHandles:574 : Cleanup 14
2018-05-14 08:45:41.655+0000: 968: debug : virEventRunDefaultImpl:324 : running default event implementation
2018-05-14 08:45:41.655+0000: 968: debug : virEventPollCleanupTimeouts:525 : Cleanup 2
2018-05-14 08:45:41.655+0000: 968: debug : virEventPollCleanupHandles:574 : Cleanup 14
2018-05-14 08:45:41.655+0000: 968: debug : virEventPollMakePollFDs:401 : Prepare n=0 w=1, f=5 e=1 d=0
2018-05-14 08:45:41.655+0000: 968: debug : virEventPollMakePollFDs:401 : Prepare n=1 w=2, f=7 e=1 d=0
2018-05-14 08:45:41.656+0000: 968: debug : virEventPollMakePollFDs:401 : Prepare n=2 w=3, f=10 e=1 d=0
2018-05-14 08:45:41.656+0000: 968: debug : virEventPollMakePollFDs:401 : Prepare n=3 w=4, f=11 e=1 d=0
2018-05-14 08:45:41.656+0000: 968: debug : virEventPollMakePollFDs:401 : Prepare n=4 w=5, f=12 e=1 d=0
2018-05-14 08:45:41.656+0000: 968: debug : virEventPollMakePollFDs:401 : Prepare n=5 w=6, f=13 e=1 d=0
2018-05-14 08:45:41.656+0000: 968: debug : virEventPollMakePollFDs:401 : Prepare n=6 w=7, f=14 e=1 d=0
2018-05-14 08:45:41.656+0000: 968: debug : virEventPollMakePollFDs:401 : Prepare n=7 w=8, f=15 e=1 d=0
2018-05-14 08:45:41.656+0000: 968: debug : virEventPollMakePollFDs:401 : Prepare n=8 w=9, f=16 e=1 d=0
2018-05-14 08:45:41.656+0000: 968: debug : virEventPollMakePollFDs:401 : Prepare n=9 w=10, f=17 e=0 d=0
2018-05-14 08:45:41.656+0000: 968: debug : virEventPollMakePollFDs:401 : Prepare n=10 w=11, f=17 e=1 d=0
2018-05-14 08:45:41.656+0000: 968: debug : virEventPollMakePollFDs:401 : Prepare n=11 w=12, f=22 e=1 d=0
2018-05-14 08:45:41.656+0000: 968: debug : virEventPollMakePollFDs:401 : Prepare n=12 w=13, f=23 e=1 d=0
2018-05-14 08:45:41.656+0000: 968: debug : virEventPollMakePollFDs:401 : Prepare n=13 w=18, f=20 e=1 d=0
2018-05-14 08:45:41.656+0000: 968: debug : virEventPollCalculateTimeout:338 : Calculate expiry of 2 timers
2018-05-14 08:45:41.656+0000: 968: debug : virEventPollCalculateTimeout:346 : Got a timeout scheduled for 1526287546655
2018-05-14 08:45:41.656+0000: 968: debug : virEventPollCalculateTimeout:359 : Schedule timeout then=1526287546655 now=1526287541656
2018-05-14 08:45:41.656+0000: 968: debug : virEventPollCalculateTimeout:369 : Timeout at 1526287546655 due in 4999 ms
2018-05-14 08:45:41.656+0000: 968: info : virEventPollRunOnce:640 : EVENT_POLL_RUN: nhandles=13 timeout=4999
2018-05-14 08:45:41.656+0000: 1009: info : virObjectRef:388 : OBJECT_REF: obj=0x7f40340019b0
2018-05-14 08:45:41.656+0000: 1009: info : virObjectRef:388 : OBJECT_REF: obj=0x7f40340019b0
2018-05-14 08:45:41.656+0000: 1009: debug : virThreadJobSet:96 : Thread 1009 (virNetServerHandleJob) is now running job remoteDispatchDomainSnapshotLookupByName
2018-05-14 08:45:41.656+0000: 1009: info : virObjectNew:254 : OBJECT_NEW: obj=0x7f40400015e0 classname=virDomain
2018-05-14 08:45:41.656+0000: 1009: info : virObjectRef:388 : OBJECT_REF: obj=0x7f4038002000
2018-05-14 08:45:41.656+0000: 1009: debug : virDomainSnapshotLookupByName:788 : dom=0x7f40400015e0, (VM: name=WIN7x64_1, uuid=727ec606-c8eb-48f8-b439-cfa439df5fc0), name=ORIGIN, flags=0x0
2018-05-14 08:45:41.660+0000: 1009: info : virObjectNew:254 : OBJECT_NEW: obj=0x7f4040001570 classname=virDomainSnapshot
2018-05-14 08:45:41.661+0000: 1009: info : virObjectRef:388 : OBJECT_REF: obj=0x7f40400015e0
2018-05-14 08:45:41.661+0000: 1009: info : virObjectUnref:350 : OBJECT_UNREF: obj=0x7f40400015e0
2018-05-14 08:45:41.661+0000: 1009: info : virObjectUnref:350 : OBJECT_UNREF: obj=0x7f4040001570
2018-05-14 08:45:41.661+0000: 1009: info : virObjectUnref:352 : OBJECT_DISPOSE: obj=0x7f4040001570
2018-05-14 08:45:41.661+0000: 1009: info : virObjectUnref:350 : OBJECT_UNREF: obj=0x7f40400015e0
2018-05-14 08:45:41.661+0000: 1009: info : virObjectUnref:352 : OBJECT_DISPOSE: obj=0x7f40400015e0
2018-05-14 08:45:41.661+0000: 1009: info : virObjectUnref:350 : OBJECT_UNREF: obj=0x7f4038002000
2018-05-14 08:45:41.662+0000: 1009: debug : virThreadJobClear:121 : Thread 1009 (virNetServerHandleJob) finished job remoteDispatchDomainSnapshotLookupByName with ret=0
2018-05-14 08:45:41.662+0000: 1009: info : virObjectUnref:350 : OBJECT_UNREF: obj=0x7f40340019b0
2018-05-14 08:45:41.662+0000: 1009: info : virObjectUnref:350 : OBJECT_UNREF: obj=0x7f40340019b0
2018-05-14 08:45:41.662+0000: 1009: info : virEventPollUpdateHandle:152 : EVENT_POLL_UPDATE_HANDLE: watch=18 events=3
2018-05-14 08:45:41.662+0000: 1009: debug : virEventPollInterruptLocked:726 : Interrupting
2018-05-14 08:45:41.662+0000: 1009: info : virObjectUnref:350 : OBJECT_UNREF: obj=0x56512a571cf0
2018-05-14 08:45:41.662+0000: 1009: info : virObjectUnref:350 : OBJECT_UNREF: obj=0x56512a5b9b40
2018-05-14 08:45:41.662+0000: 968: debug : virEventPollRunOnce:650 : Poll got 1 event(s)
2018-05-14 08:45:41.662+0000: 968: debug : virEventPollDispatchTimeouts:432 : Dispatch 2
2018-05-14 08:45:41.662+0000: 968: debug : virEventPollDispatchHandles:478 : Dispatch 13
2018-05-14 08:45:41.662+0000: 968: debug : virEventPollDispatchHandles:492 : i=0 w=1
2018-05-14 08:45:41.662+0000: 968: info : virEventPollDispatchHandles:506 : EVENT_POLL_DISPATCH_HANDLE: watch=1 events=1
2018-05-14 08:45:41.662+0000: 968: debug : virEventPollDispatchHandles:492 : i=1 w=2
2018-05-14 08:45:41.662+0000: 968: debug : virEventPollDispatchHandles:492 : i=2 w=3
2018-05-14 08:45:41.662+0000: 968: debug : virEventPollDispatchHandles:492 : i=3 w=4
2018-05-14 08:45:41.662+0000: 968: debug : virEventPollDispatchHandles:492 : i=4 w=5
2018-05-14 08:45:41.662+0000: 968: debug : virEventPollDispatchHandles:492 : i=5 w=6
2018-05-14 08:45:41.662+0000: 968: debug : virEventPollDispatchHandles:492 : i=6 w=7
2018-05-14 08:45:41.662+0000: 968: debug : virEventPollDispatchHandles:492 : i=7 w=8
2018-05-14 08:45:41.662+0000: 968: debug : virEventPollDispatchHandles:492 : i=8 w=9
2018-05-14 08:45:41.662+0000: 968: debug : virEventPollDispatchHandles:492 : i=10 w=11
2018-05-14 08:45:41.662+0000: 968: debug : virEventPollDispatchHandles:492 : i=11 w=12
2018-05-14 08:45:41.662+0000: 968: debug : virEventPollDispatchHandles:492 : i=12 w=13
2018-05-14 08:45:41.662+0000: 968: debug : virEventPollDispatchHandles:492 : i=13 w=18
2018-05-14 08:45:41.662+0000: 968: debug : virEventPollCleanupTimeouts:525 : Cleanup 2
2018-05-14 08:45:41.662+0000: 968: debug : virEventPollCleanupHandles:574 : Cleanup 14
2018-05-14 08:45:41.662+0000: 968: debug : virEventRunDefaultImpl:324 : running default event implementation
2018-05-14 08:45:41.662+0000: 968: debug : virEventPollCleanupTimeouts:525 : Cleanup 2
2018-05-14 08:45:41.662+0000: 968: debug : virEventPollCleanupHandles:574 : Cleanup 14
2018-05-14 08:45:41.662+0000: 968: debug : virEventPollMakePollFDs:401 : Prepare n=0 w=1, f=5 e=1 d=0
2018-05-14 08:45:41.662+0000: 968: debug : virEventPollMakePollFDs:401 : Prepare n=1 w=2, f=7 e=1 d=0
2018-05-14 08:45:41.662+0000: 968: debug : virEventPollMakePollFDs:401 : Prepare n=2 w=3, f=10 e=1 d=0
2018-05-14 08:45:41.662+0000: 968: debug : virEventPollMakePollFDs:401 : Prepare n=3 w=4, f=11 e=1 d=0
2018-05-14 08:45:41.662+0000: 968: debug : virEventPollMakePollFDs:401 : Prepare n=4 w=5, f=12 e=1 d=0
2018-05-14 08:45:41.662+0000: 968: debug : virEventPollMakePollFDs:401 : Prepare n=5 w=6, f=13 e=1 d=0
2018-05-14 08:45:41.662+0000: 968: debug : virEventPollMakePollFDs:401 : Prepare n=6 w=7, f=14 e=1 d=0
2018-05-14 08:45:41.662+0000: 968: debug : virEventPollMakePollFDs:401 : Prepare n=7 w=8, f=15 e=1 d=0
2018-05-14 08:45:41.662+0000: 968: debug : virEventPollMakePollFDs:401 : Prepare n=8 w=9, f=16 e=1 d=0
2018-05-14 08:45:41.662+0000: 968: debug : virEventPollMakePollFDs:401 : Prepare n=9 w=10, f=17 e=0 d=0
2018-05-14 08:45:41.662+0000: 968: debug : virEventPollMakePollFDs:401 : Prepare n=10 w=11, f=17 e=1 d=0
2018-05-14 08:45:41.662+0000: 968: debug : virEventPollMakePollFDs:401 : Prepare n=11 w=12, f=22 e=1 d=0
2018-05-14 08:45:41.662+0000: 968: debug : virEventPollMakePollFDs:401 : Prepare n=12 w=13, f=23 e=1 d=0
2018-05-14 08:45:41.662+0000: 968: debug : virEventPollMakePollFDs:401 : Prepare n=13 w=18, f=20 e=5 d=0
2018-05-14 08:45:41.662+0000: 968: debug : virEventPollCalculateTimeout:338 : Calculate expiry of 2 timers
2018-05-14 08:45:41.662+0000: 968: debug : virEventPollCalculateTimeout:346 : Got a timeout scheduled for 1526287546655
2018-05-14 08:45:41.662+0000: 968: debug : virEventPollCalculateTimeout:359 : Schedule timeout then=1526287546655 now=1526287541662
2018-05-14 08:45:41.662+0000: 968: debug : virEventPollCalculateTimeout:369 : Timeout at 1526287546655 due in 4993 ms
2018-05-14 08:45:41.662+0000: 968: info : virEventPollRunOnce:640 : EVENT_POLL_RUN: nhandles=13 timeout=4993
2018-05-14 08:45:41.662+0000: 968: debug : virEventPollRunOnce:650 : Poll got 1 event(s)
2018-05-14 08:45:41.662+0000: 968: debug : virEventPollDispatchTimeouts:432 : Dispatch 2
2018-05-14 08:45:41.662+0000: 968: debug : virEventPollDispatchHandles:478 : Dispatch 13
2018-05-14 08:45:41.662+0000: 968: debug : virEventPollDispatchHandles:492 : i=0 w=1
2018-05-14 08:45:41.662+0000: 968: debug : virEventPollDispatchHandles:492 : i=1 w=2
2018-05-14 08:45:41.662+0000: 968: debug : virEventPollDispatchHandles:492 : i=2 w=3
2018-05-14 08:45:41.662+0000: 968: debug : virEventPollDispatchHandles:492 : i=3 w=4
2018-05-14 08:45:41.662+0000: 968: debug : virEventPollDispatchHandles:492 : i=4 w=5
2018-05-14 08:45:41.662+0000: 968: debug : virEventPollDispatchHandles:492 : i=5 w=6
2018-05-14 08:45:41.662+0000: 968: debug : virEventPollDispatchHandles:492 : i=6 w=7
2018-05-14 08:45:41.662+0000: 968: debug : virEventPollDispatchHandles:492 : i=7 w=8
2018-05-14 08:45:41.662+0000: 968: debug : virEventPollDispatchHandles:492 : i=8 w=9
2018-05-14 08:45:41.662+0000: 968: debug : virEventPollDispatchHandles:492 : i=10 w=11
2018-05-14 08:45:41.662+0000: 968: debug : virEventPollDispatchHandles:492 : i=11 w=12
2018-05-14 08:45:41.662+0000: 968: debug : virEventPollDispatchHandles:492 : i=12 w=13
2018-05-14 08:45:41.662+0000: 968: debug : virEventPollDispatchHandles:492 : i=13 w=18
2018-05-14 08:45:41.662+0000: 968: info : virEventPollDispatchHandles:506 : EVENT_POLL_DISPATCH_HANDLE: watch=18 events=2
2018-05-14 08:45:41.662+0000: 968: info : virEventPollUpdateHandle:152 : EVENT_POLL_UPDATE_HANDLE: watch=18 events=1
2018-05-14 08:45:41.662+0000: 968: debug : virEventPollInterruptLocked:722 : Skip interrupt, 1 139914317211200
2018-05-14 08:45:41.662+0000: 968: debug : virEventPollCleanupTimeouts:525 : Cleanup 2
2018-05-14 08:45:41.662+0000: 968: debug : virEventPollCleanupHandles:574 : Cleanup 14
2018-05-14 08:45:41.662+0000: 968: debug : virEventRunDefaultImpl:324 : running default event implementation
2018-05-14 08:45:41.662+0000: 968: debug : virEventPollCleanupTimeouts:525 : Cleanup 2
2018-05-14 08:45:41.662+0000: 968: debug : virEventPollCleanupHandles:574 : Cleanup 14
2018-05-14 08:45:41.662+0000: 968: debug : virEventPollMakePollFDs:401 : Prepare n=0 w=1, f=5 e=1 d=0
2018-05-14 08:45:41.662+0000: 968: debug : virEventPollMakePollFDs:401 : Prepare n=1 w=2, f=7 e=1 d=0
2018-05-14 08:45:41.662+0000: 968: debug : virEventPollMakePollFDs:401 : Prepare n=2 w=3, f=10 e=1 d=0
2018-05-14 08:45:41.662+0000: 968: debug : virEventPollMakePollFDs:401 : Prepare n=3 w=4, f=11 e=1 d=0
2018-05-14 08:45:41.662+0000: 968: debug : virEventPollMakePollFDs:401 : Prepare n=4 w=5, f=12 e=1 d=0
2018-05-14 08:45:41.662+0000: 968: debug : virEventPollMakePollFDs:401 : Prepare n=5 w=6, f=13 e=1 d=0
2018-05-14 08:45:41.662+0000: 968: debug : virEventPollMakePollFDs:401 : Prepare n=6 w=7, f=14 e=1 d=0
2018-05-14 08:45:41.662+0000: 968: debug : virEventPollMakePollFDs:401 : Prepare n=7 w=8, f=15 e=1 d=0
2018-05-14 08:45:41.662+0000: 968: debug : virEventPollMakePollFDs:401 : Prepare n=8 w=9, f=16 e=1 d=0
2018-05-14 08:45:41.662+0000: 968: debug : virEventPollMakePollFDs:401 : Prepare n=9 w=10, f=17 e=0 d=0
2018-05-14 08:45:41.662+0000: 968: debug : virEventPollMakePollFDs:401 : Prepare n=10 w=11, f=17 e=1 d=0
2018-05-14 08:45:41.662+0000: 968: debug : virEventPollMakePollFDs:401 : Prepare n=11 w=12, f=22 e=1 d=0
2018-05-14 08:45:41.662+0000: 968: debug : virEventPollMakePollFDs:401 : Prepare n=12 w=13, f=23 e=1 d=0
2018-05-14 08:45:41.662+0000: 968: debug : virEventPollMakePollFDs:401 : Prepare n=13 w=18, f=20 e=1 d=0
2018-05-14 08:45:41.662+0000: 968: debug : virEventPollCalculateTimeout:338 : Calculate expiry of 2 timers
2018-05-14 08:45:41.662+0000: 968: debug : virEventPollCalculateTimeout:346 : Got a timeout scheduled for 1526287546655
2018-05-14 08:45:41.662+0000: 968: debug : virEventPollCalculateTimeout:359 : Schedule timeout then=1526287546655 now=1526287541662
2018-05-14 08:45:41.662+0000: 968: debug : virEventPollCalculateTimeout:369 : Timeout at 1526287546655 due in 4993 ms
2018-05-14 08:45:41.662+0000: 968: info : virEventPollRunOnce:640 : EVENT_POLL_RUN: nhandles=13 timeout=4993
2018-05-14 08:45:41.662+0000: 968: debug : virEventPollRunOnce:650 : Poll got 1 event(s)
2018-05-14 08:45:41.662+0000: 968: debug : virEventPollDispatchTimeouts:432 : Dispatch 2
2018-05-14 08:45:41.662+0000: 968: debug : virEventPollDispatchHandles:478 : Dispatch 13
2018-05-14 08:45:41.662+0000: 968: debug : virEventPollDispatchHandles:492 : i=0 w=1
2018-05-14 08:45:41.662+0000: 968: debug : virEventPollDispatchHandles:492 : i=1 w=2
2018-05-14 08:45:41.663+0000: 968: debug : virEventPollDispatchHandles:492 : i=2 w=3
2018-05-14 08:45:41.663+0000: 968: debug : virEventPollDispatchHandles:492 : i=3 w=4
2018-05-14 08:45:41.663+0000: 968: debug : virEventPollDispatchHandles:492 : i=4 w=5
2018-05-14 08:45:41.663+0000: 968: debug : virEventPollDispatchHandles:492 : i=5 w=6
2018-05-14 08:45:41.663+0000: 968: debug : virEventPollDispatchHandles:492 : i=6 w=7
2018-05-14 08:45:41.663+0000: 968: debug : virEventPollDispatchHandles:492 : i=7 w=8
2018-05-14 08:45:41.663+0000: 968: debug : virEventPollDispatchHandles:492 : i=8 w=9
2018-05-14 08:45:41.663+0000: 968: debug : virEventPollDispatchHandles:492 : i=10 w=11
2018-05-14 08:45:41.663+0000: 968: debug : virEventPollDispatchHandles:492 : i=11 w=12
2018-05-14 08:45:41.663+0000: 968: debug : virEventPollDispatchHandles:492 : i=12 w=13
2018-05-14 08:45:41.663+0000: 968: debug : virEventPollDispatchHandles:492 : i=13 w=18
2018-05-14 08:45:41.663+0000: 968: info : virEventPollDispatchHandles:506 : EVENT_POLL_DISPATCH_HANDLE: watch=18 events=1
2018-05-14 08:45:41.663+0000: 968: info : virEventPollUpdateHandle:152 : EVENT_POLL_UPDATE_HANDLE: watch=18 events=1
2018-05-14 08:45:41.663+0000: 968: debug : virEventPollInterruptLocked:722 : Skip interrupt, 1 139914317211200
2018-05-14 08:45:41.663+0000: 968: info : virEventPollUpdateTimeout:265 : EVENT_POLL_UPDATE_TIMEOUT: timer=10 frequency=5000
2018-05-14 08:45:41.663+0000: 968: debug : virEventPollUpdateTimeout:282 : Set timer freq=5000 expires=1526287546663
2018-05-14 08:45:41.663+0000: 968: debug : virEventPollInterruptLocked:722 : Skip interrupt, 1 139914317211200
2018-05-14 08:45:41.663+0000: 968: info : virObjectRef:388 : OBJECT_REF: obj=0x56512a5b9b40
2018-05-14 08:45:41.663+0000: 968: info : virObjectRef:388 : OBJECT_REF: obj=0x56512a571cf0
2018-05-14 08:45:41.663+0000: 968: info : virEventPollUpdateHandle:152 : EVENT_POLL_UPDATE_HANDLE: watch=18 events=1
2018-05-14 08:45:41.663+0000: 968: debug : virEventPollInterruptLocked:722 : Skip interrupt, 1 139914317211200
2018-05-14 08:45:41.663+0000: 968: debug : virEventPollCleanupTimeouts:525 : Cleanup 2
2018-05-14 08:45:41.663+0000: 968: debug : virEventPollCleanupHandles:574 : Cleanup 14
2018-05-14 08:45:41.663+0000: 1004: info : virObjectRef:388 : OBJECT_REF: obj=0x7f40340019b0
2018-05-14 08:45:41.663+0000: 1004: info : virObjectRef:388 : OBJECT_REF: obj=0x7f40340019b0
2018-05-14 08:45:41.663+0000: 1004: debug : virThreadJobSet:96 : Thread 1004 (virNetServerHandleJob) is now running job remoteDispatchDomainRevertToSnapshot
2018-05-14 08:45:41.663+0000: 1004: info : virObjectNew:254 : OBJECT_NEW: obj=0x7f4028003150 classname=virDomain
2018-05-14 08:45:41.663+0000: 1004: info : virObjectRef:388 : OBJECT_REF: obj=0x7f4038002000
2018-05-14 08:45:41.663+0000: 1004: info : virObjectNew:254 : OBJECT_NEW: obj=0x7f40280059f0 classname=virDomainSnapshot
2018-05-14 08:45:41.663+0000: 1004: info : virObjectRef:388 : OBJECT_REF: obj=0x7f4028003150
2018-05-14 08:45:41.663+0000: 968: debug : virEventRunDefaultImpl:324 : running default event implementation
2018-05-14 08:45:41.663+0000: 1004: debug : virDomainRevertToSnapshot:1057 : snapshot=0x7f40280059f0, flags=0x0
2018-05-14 08:45:41.663+0000: 968: debug : virEventPollCleanupTimeouts:525 : Cleanup 2
2018-05-14 08:45:41.663+0000: 968: debug : virEventPollCleanupHandles:574 : Cleanup 14
2018-05-14 08:45:41.663+0000: 968: debug : virEventPollMakePollFDs:401 : Prepare n=0 w=1, f=5 e=1 d=0
2018-05-14 08:45:41.663+0000: 968: debug : virEventPollMakePollFDs:401 : Prepare n=1 w=2, f=7 e=1 d=0
2018-05-14 08:45:41.663+0000: 968: debug : virEventPollMakePollFDs:401 : Prepare n=2 w=3, f=10 e=1 d=0
2018-05-14 08:45:41.663+0000: 968: debug : virEventPollMakePollFDs:401 : Prepare n=3 w=4, f=11 e=1 d=0
2018-05-14 08:45:41.663+0000: 968: debug : virEventPollMakePollFDs:401 : Prepare n=4 w=5, f=12 e=1 d=0
2018-05-14 08:45:41.663+0000: 968: debug : virEventPollMakePollFDs:401 : Prepare n=5 w=6, f=13 e=1 d=0
2018-05-14 08:45:41.663+0000: 968: debug : virEventPollMakePollFDs:401 : Prepare n=6 w=7, f=14 e=1 d=0
2018-05-14 08:45:41.663+0000: 968: debug : virEventPollMakePollFDs:401 : Prepare n=7 w=8, f=15 e=1 d=0
2018-05-14 08:45:41.663+0000: 968: debug : virEventPollMakePollFDs:401 : Prepare n=8 w=9, f=16 e=1 d=0
2018-05-14 08:45:41.663+0000: 968: debug : virEventPollMakePollFDs:401 : Prepare n=9 w=10, f=17 e=0 d=0
2018-05-14 08:45:41.663+0000: 968: debug : virEventPollMakePollFDs:401 : Prepare n=10 w=11, f=17 e=1 d=0
2018-05-14 08:45:41.663+0000: 968: debug : virEventPollMakePollFDs:401 : Prepare n=11 w=12, f=22 e=1 d=0
2018-05-14 08:45:41.663+0000: 968: debug : virEventPollMakePollFDs:401 : Prepare n=12 w=13, f=23 e=1 d=0
2018-05-14 08:45:41.663+0000: 968: debug : virEventPollMakePollFDs:401 : Prepare n=13 w=18, f=20 e=1 d=0
2018-05-14 08:45:41.663+0000: 968: debug : virEventPollCalculateTimeout:338 : Calculate expiry of 2 timers
2018-05-14 08:45:41.663+0000: 968: debug : virEventPollCalculateTimeout:346 : Got a timeout scheduled for 1526287546663
2018-05-14 08:45:41.663+0000: 968: debug : virEventPollCalculateTimeout:359 : Schedule timeout then=1526287546663 now=1526287541663
2018-05-14 08:45:41.663+0000: 968: debug : virEventPollCalculateTimeout:369 : Timeout at 1526287546663 due in 5000 ms
2018-05-14 08:45:41.663+0000: 968: info : virEventPollRunOnce:640 : EVENT_POLL_RUN: nhandles=13 timeout=5000
2018-05-14 08:45:41.684+0000: 1004: error : _vboxDomainSnapshotRestore:375 : internal error: could not restore snapshot for domain WIN7x64_1
2018-05-14 08:45:41.687+0000: 1004: info : virObjectUnref:350 : OBJECT_UNREF: obj=0x7f40280059f0
2018-05-14 08:45:41.687+0000: 1004: info : virObjectUnref:352 : OBJECT_DISPOSE: obj=0x7f40280059f0
2018-05-14 08:45:41.687+0000: 1004: info : virObjectUnref:350 : OBJECT_UNREF: obj=0x7f4028003150
2018-05-14 08:45:41.687+0000: 1004: info : virObjectUnref:350 : OBJECT_UNREF: obj=0x7f4028003150
2018-05-14 08:45:41.687+0000: 1004: info : virObjectUnref:352 : OBJECT_DISPOSE: obj=0x7f4028003150
2018-05-14 08:45:41.687+0000: 1004: info : virObjectUnref:350 : OBJECT_UNREF: obj=0x7f4038002000
2018-05-14 08:45:41.687+0000: 1004: debug : virThreadJobClear:121 : Thread 1004 (virNetServerHandleJob) finished job remoteDispatchDomainRevertToSnapshot with ret=-1
2018-05-14 08:45:41.687+0000: 1004: info : virObjectUnref:350 : OBJECT_UNREF: obj=0x7f40340019b0

Could someone please shed some light on this problem?

Thanks in advance.

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