13
It was just a test, because in some modules that I downloaded from the folder SVN/XoopsModules26, there is still these three lines:
$modversion['dirmoduleadmin'] = '/class';
$modversion['icons16'] = '../../media/xoops/images/icons/16';
$modversion['icons32'] = '../../media/xoops/images/icons/32';
I don't know why were added...!
so the solution is the one that posted to message #7