It looks like you may have two possibilities on discussions.apple:
"I just had to exclude the files named in system.log "Aug 30 13:28:56 noname com.apple.backupd: Error: (-41) SrcErr:NO ......" and the backup finished successfully."
"I think excluding the files from Time Machine is just ignoring the problem. It sounds like you need to repair your startup disk."
But please also click on links posted by BDAqua.
Hope this helps.