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Could you provide a little more information? What forum are you using? What version of XOOPS? What version of PHP? What version of MySQL? Apache or IIS web server? Do you get any PHP debug errors? Do you get any MySQL debug errors?
There's a few things that can cause that error. Narrowing down your environment and any system error messages you get will help troubleshoot the problem.
Insanity can be defined as "doing the same thing over and over and expecting different results."
Stupidity is not a crime. Therefore, you are free to go.