“tfp: failed on 0” repeating in system-log

Does anybody know what this means in the system log: Apr 2 10:14:04 server kernel[0]: (24822: ps)tfp: failed on 0: Apr 2 10:14:06 server kernel[0]: (24825: ps)tfp: failed on 0: Apr 2 10:14:07 server kernel[0]: (24826: ps)tfp: failed on 0: Apr 2 10:14:10 server kernel[0]: (24831: ps)tfp: failed on 0: It keeps on repeating in the log, but there are no other abnormalities. The server is a dual 2.3 Ghz G5 Xserve running OD, AFP and Kerio Mailserver>