I've ran into Sharks problem a couple times. Useally dealing with when I renamed a .uti and any files attached to it. It's gave that error. Rename them back and still same error. Had to reinstall them from the zip for them to work in KSE. Also a couple mods will give this error strieght from the zip file...mostly the ones that come with TSLpatcher methods. The patcher is only needed if you choose not to do the work your self.
Some of these errors may be pointed to not having Kotor1 installed but just having Kotor2 installed. I have found that some files modded from kotor1 to work with kotor2 can not be modded when you have just kotor2 installed.