Template set crashed

I accidently erased my template (template set, replacement set and so on) sets etc., now if I upload another style he still uses the default template, which is shown in the datase under template but not in the admin menu.
Even if I say the section or forum is only permitted to use style *inputnumberhereorstylenamehere* he still uses the default template.

What shall I do?

Please help me I did not made a backup :/ (yeah I know.. stupid).

[Logician]

Did you try pointing the correct "replacement" and "template" sets in the STYLE/MODIFY/PROPERTIES?