Can't create or edit catagories

I recently installed Vanilla, and it's working fine except for the catagories section. Everytime I try to create a new catagory or edit one, I get this message: A fatal, non-recoverable error has occurred Technical information (for support personel): Error Message The "Checkbox" class referenced by "Checkbox" does not appear to exist. Affected Elements ObjectFactory.NewObject(); For additional support documentation, visit the Lussumo Documentation website at: lussumo.com/docs I've looked for a way to fix it, but can't find anything. Thanks. Maugan Ra.

fysicsluvr

try redownloading and reuploading the core files for vanilla.