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Zicane:
This is one of the features in Catzwolf's modules, the way he used to handle the access to a module's features. I'd bet you can't find the file groupaccess.php inside the /include/ directory. As you can see in the debug message, both the auxiliary file functions.php and the file category.php make use of this file to determine what groups have access to the module.
Most probably you'll find an instance of groupaccess.php in another of Catzwolf's modules. Once you find a copy, just copy it (pardon the pun) to the /include/ directory. This will probably solve at least this problem.
Cheers.
