I thought this was solved but now I have a client with the same error but they have VSS enabled correctly. I am not sure which log to look at but since the below indicates error from bpbrm I created that log directory and am rerunning the backup. The backup is a diff. The errors we are seeing are intermittant and inconsistant with clients. Hard to figure out.
Error from job display in java console
09/11/2013 17:08:57 - Warning bpbrm (pid=7081) from client ifwlwss1: WRN - can't open object: System State:\System Files\System Files (WIN32 -536805679: Unknown error)
09/11/2013 17:08:57 - Error bpbrm (pid=7081) from client ifwlwss1: ERR - Error encountered while attempting to get additional files for System State:\
09/11/2013 17:08:57 - Warning bpbrm (pid=7081) from client ifwlwss1: WRN - can't open object: System State:\Automated System Recovery\BCD\BCD (WIN32 -536805679: Unknown error)
09/11/2013 17:08:57 - Warning bpbrm (pid=7081) from client ifwlwss1: WRN - can't open object: System State:\Internet Information Services\IISCONFIG (WIN32 -536805679: Unknown error)
09/11/2013 17:08:57 - Warning bpbrm (pid=7081) from client ifwlwss1: WRN - can't open object: System State:\Internet Information Services\IISMETABASE (WIN32 -536805679: Unknown error)
09/11/2013 17:08:58 - Warning bpbrm (pid=7081) from client ifwlwss1: WRN - can't open object: System State:\COM+ Class Registration Database\COM+ REGDB (WIN32 -536805679: Unknown error)
09/11/2013 17:08:58 - Warning bpbrm (pid=7081) from client ifwlwss1: WRN - can't open object: System State:\Registry\Registry (WIN32 -536805679: Unknown error)
09/11/2013 17:08:58 - Warning bpbrm (pid=7081) from client ifwlwss1: WRN - can't open object: System State:\Windows Management Instrumentation\WMI (WIN32 -536805679: Unknown error)