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Seriously we need more information - what module or what were you doing when this happened? What XOOPS version are you using? What did you find and try in using search and the FAQ section? Without this information we will be doing a lot of guessing. It seems to me you have missing or corrupt files but without knowing what you were doing we can only guess.
Here is a starting point
in FAQif you can't figure it out:
Give information about your siteCopy the following template into your post and fill-in as much information as possible. The more information you give, the more likely you will receive a quick and effective reply to your post.
XOOPS Version:
Module Name/Version:
PHP Version:
MySQL Version:
Web Server Software (Apache/IIS/Other):
Operating System:
Theme you are using:
Custom template: (Yes/No)
PHP Debug Messages:
MySQL Debug Messages:
Smarty Debug Messages:
A full description of the issue: