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I think I know what the problem is here, You have all the files for phpmyadmin in the XOOPS directory, not in a subdirectory of the root directory. So maybe you installed XOOPS first, then when you uploaded phpmyadmin you over wrote index.php of XOOPS with the one for phpmyadmin. Remove phpmyadmin, reupload your XOOPS files, then install phpmyadmin in a subdirectory.