error log..

I got following error log message...
due I am a newbie, I don't know what to do about this error...

can you please help me?

the log entry:

Type php
Date Thursday, 6 March, 2008 - 11:25
User dragon
Location http://www.to-be-sharing.org/test/admin/logs/status
Referrer http://www.to-be-sharing.org/test/admin/build/menu
Message Missing argument 2 for textsize_help() in /home2/tobeshar/public_html/test/sites/all/modules/textsize/textsize.module on line 12.
Severity error
Hostname 88.227.223.121

thanks in advance for your support...

Manfred