ERROR--Save a sub-site to a SITE Template

Hi,

Please advise the below error when I try to save a sub-site as a Site Template....

Thanks

Error 

An unexpected error has occurred. 
 

Troubleshoot issues with Microsoft SharePoint Foundation.  

Correlation ID: 0b7aebe7-6c84-44fb-b2cd-773a10c627a8 

Date and Time: 6/5/2013 6:05:54 PM