VSS failed to initialize for directives, error=0x8007007b

My backup server is running 7.6.1.7 and my Windows 2008 R2 client is running 7.6.2.2.  Both are 64-bit.  When trying to backup the Windows 2008 R2 client, I get an error message - VSS failed to initialize for directives, error=0x8007007b.  More details below:

--- Unsuccessful Save Sets ---

* nj06nt051:C:\ ERROR: VSS failed to initialize for directives, error=0x8007007b: The filename, directory name, or volume label syntax is incorrect.
* nj06nt051:C:\
* nj06nt051:C:\ 7154:save: Unable to set up VSS filesystem directives. Failed to back up C:\.
     * :  Failed with error(s)
* nj06nt051:B:\ ERROR: VSS failed to initialize for directives, error=0x8007007b: The filename, directory name, or volume label syntax is incorrect.
* nj06nt051:B:\
* nj06nt051:B:\ 7154:save: Unable to set up VSS filesystem directives. Failed to back up B:\.
     * :  Failed with error(s)

I am unclear why this is happening.  I have uninstalled and re-installed Networker client.  Also, rebooted the client multiple times.