System state backup on Server 2012 R2

Using the WSB utility, I get the following error "The process cannot access the file because it is being used by another process."

I ran the utility through powershell and got the same error.  I checked the log files and get this error "Error in deletion of [C:\System Volume Information\001.dat] while pruning the target VHD: Error [0x80070020] The process cannot access the file because it is being used by another process."

Any help would be appreciated.

Thanks