How to resolve Client.InvalidManifest: Invalid block device mapping: Invalid virtual name 'ebs0'?

Question

To give a background,

http://docs.amazonwebservices.com/AWSEC2/2008-02-01/GettingStartedGuide/index.html?creating-an-image.html

Im follwing the above guide from amazon to create a s3 backed AMI from ebs based ec2 instance.

Basically, it involves the following 3 steps:

1. Bundle the volume using ec2-bundle-vol
2. Upload the bundle to s3 using ec2-upload-bundle
3. Register the newly created AMI using ec2-register

The first two steps are working just fine. I have bundled and uploaded the data to s3 but while registering i get the following error.

Client.InvalidManifest: Invalid block device mapping: Invalid virtual name 'ebs0'

Does the new AMI still uses EBS? If so, How do i force it to use S3?

Should i use --block-device-mapping in any one of the step?

Thanks in advance.