Weapons Errors

Hi, I recently bought gmod and I have downloaded some packs of weapons (Black Ops: Mega Pack 0.5, KCGEORGE’s Rifle Pack 2, and more). But none of them works. When i use them, i got ERROR over me(in my hands).
I put all packs in the addons folder like the instructions say. I googled for this error and no one seems to have it.

Please Help me!

Have you extracted the files from the downloads? Also those sound like addons that require counter-strike:source, however what source games do you own,just half life 2 or any other source games?

Is this your Steam account? If so, you don’t own CSS and that might be the problem.