Originalmente postado por HellJumper:

I'm not 100% sure what could be wrong. I don't use the latest versions myself. Try contacting the author of the SMD tools script: http://steamcommunity.com/groups/BlenderSourceTools

Thanks for reply. I have found out that this might be an blender bug. I have therfor asked on stack exchange.

I have manualy added the import/export plugins in the Blender plugin directory. The plugins appear in Blender, but can not be activated. Could anyone explain me how to fix this?

Here are the errors I get: https://dl.dropboxusercontent.com/u/5916520/Errors.txt