5
Remove all _vti_conf folders from the /modules/ folder (and anywhere else you see them), that should work for starters. And make sure all modules you have added have the correct module structure: there always should be a xoops_version.php file in the /modules/yourmodule/ folder. If it is like this: /modules/yourmodule/yourmodule/xoops_version.php, then it is wrong, and you get the error message you have.
Herko