Guys,

Anyone know why my logs are full of these messages?

ERROR - 2007-08-20 19:23:04—> Severity: Warning —> chmod() [function.chmod]: Operation not permitted /path/system/libraries/Log.php 113

ls -ld system/logs
gives
drwxrwxrwx 2 username groupname 4096 Aug 20 16:42 system/logs/
and the Log script can definitely write to the logs because it writes to the log everytime I load a page.

Anything else I can post to shed some light on this problem?

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Some more investigation reveals it’s happening whenever there’s a 404 page.
The logs give:

ERROR - 2007-08-20 19:34:40—> 404 Page Not Found—>
ERROR - 2007-08-20 19:34:40—> Severity: Warning —> chmod() ...etc…

Does the user your webserver runs as have permission to chmod those files?  What does ls -l system/logs output? If you chmod the files to 777 do you still get the errors?

Thanks - files have the following permissions:
ls -l system/logs
-rw-rw-rw-  1 nobody nobody   974 Aug 21 10:30 log-2007-08-21.php

and, as I said earlier, the directory has these permissions:
ls -ld system/logs
drwxrwxrwx 2 username groupname 4096 Aug 20 16:42 system/logs/