I'm seeing an error in my Windows event log with the following signature:

  • Log: Application
  • Source: SideBySide
  • EventId: 35
  • Level: Error
  • Description: Activation context generation failed for "C:\Program Files\Microsoft Office 15\root\office15\lync.exe.Manifest".Error in manifest or policy file "C:\Program Files\Microsoft Office 15\root\office15\UccApi.DLL" on line 1. Component identity found in manifest does not match the identity of the component requested. Reference is UccApi,processorArchitecture="AMD64",type="win32",version="". Definition is UccApi,processorArchitecture="x86",type="win32",version="". Please use sxstrace.exe for detailed diagnosis.

I've not seen any negative symptoms related; but like to keep my logs clear of errors where possible.

How can I resolve this issue / prevent this error?

  • Just logging here for the benefit of others in future; already resolved. – JohnLBevan Apr 18 '17 at 15:25

I resolved this by amending the manifest file reported in the error (C:\Program Files\Microsoft Office 15\root\office15\LYNC.EXE.MANIFEST), changing the processor architecture of the UccApi DLL.


<assemblyIdentity type="win32" name="UccApi" version="" processorArchitecture="*"></assemblyIdentity>


<assemblyIdentity type="win32" name="UccApi" version="" processorArchitecture="x86"></assemblyIdentity>

  • 1
    These errors can usually be ignored, but nice job fixing it. Thanks for posting the answer. – Lucky Luke Apr 19 '17 at 17:48
  • 1
    @JohnLBevan - thank you for sharing the ACTUAL answer. It's better than Microsoft's suggestion to just "ignore" the problem as suggested here: support.microsoft.com/en-us/help/3077028/… – Leo Gurdian Jan 16 '18 at 21:09

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