Back up error

Hi

My friday back is failed. I have run manual back up. I dont know after successful completion of 80% i am getting below error.

Error bpbrm(pid=4192) db_FLISTsend failed: disk is full (155)

Error bpsched(pid=2608) suspending further backup attempts for client 192.168.30.12, policy tuiodcfull, schedule Weeklyfulllfriday because it has exceeded the configured number of tries

Error bpsched(pid=2608) backup of client 192.168.30.12 exited with status 155 (disk is full)

I have free tapes in my pool.Kindly help me.