Getting error 156 while backup .

hi team ,

i am using netbackup 6.5 .

i am getting an error 156 .i have checked the logs .

i am geting this error

Warning bpbrm(pid=1532) from client xxx: WRN - can't open directory: zzz (WIN32 2: The system cannot find the file specified. )

its giving a snapshot error

coul you please help .