Gluster users - Jul 2013 - lstat with no such file or directory in bricks log

Hello

I have replication volume with 2 servers an I got alot of these errors 
messages in bricks log

[2013-07-16 13:34:21.088142] E [posix.c:224:posix_stat] 
0-VOL_REPL1-posix: lstat on 
/opt/data/b1/.glusterfs/85/31/8531da33-f441-49f4-8f4e-0b1c9c5c3ff7 
failed: No such file or directory
[2013-07-16 13:34:21.088187] I [server3_1-fops.c:1085:server_unlink_cbk] 
0-VOL_REPL1-server: 12: UNLINK 
<gfid:7178a446-7a17-4864-a398-9702636adae5>/e1e9cdd2-d015-457e-8dd8-40012036669e
(8531da33-f441-49f4-8f4e-0b1c9c5c3ff7) ==> -1 (No such file or directory)

What these messages and how can I fix this ?