Module Problem

I'm having a problem on module, i install a module called "Categorysellers" then when i try to configure it in the combo box under the "layout" nothing appears first i though the only problem is that module called "Categorysellers" then i found out that every module i have doenst show anything in the combo box under the "layout" please help been searching for the answer but no luck..

i already found out the problem this is already solved thanks...