Hey there buddy, this is caused by you downloading your CS:S / HL2 files from cs.cheaters or any other online website, the only way to fix this is to delete your CS:S files that you have downloaded, leaving your Hl2 files in your addons folder.
The issue I had when this happened was back before I owned CSS. I accidentally copied my CSS files directly into gmod from CScheater and overwrote, instead of a new folder.
Probably what happened to you, verify the files and you should be good.
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