Missing error descrition

Hi,

I'm not to familiar with apache. I have a couple of web applications runing
on a Apache Web Server 2.2.4 installed on a Windows Server 2003. Everthing
is working fine and the applications do not report any errors. For some
reasons the Apache Server which runs with loglevel warn, tracks errors
without any description. It looks like:

[Tue Feb 12 18:06:15 2008] [error] [client 192.148.3.4] , referer:
http://server-name/app
[Tue Feb 12 18:06:44 2008] [error] [client 192.148.3.4] , referer:
http://server-name/app

After a while of debugging I expect the server reports an error when a html
form is submitted by javascript. For example the application opens a second
window for data input and refreshes the parent window when data was saved to
the database.

Does anybody know about the behavior? Can I do anything to prevent this
behavior. Like I said the web applications works fine and the users do not
receive any errors.

Many thanks,
Dirk