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If you are reporting problems, please ALWAYS include your XOOPS version, PHP version, your module's version, and the steps to reproduce the problem!!!
Please also turn on in Admin the Debug function, and let us know what errors, if any, it shows.'
It helps to identify potential solutions.
In the meantime, you can install the "Tools" module - it has a tab for updating/clearing the cache:
https://github.com/XoopsModules25x/tools
Let us know if it worked for you.