Addons not working

For the past couple months my Garry’s Mod addons haven’t been working, and I’ve been trying to find a way to fix it ever since, but no luck.

In the console it says

“Not loading addon (‘addon name’) - file doesn’t exist
Couldn’t mount addon (‘addon name’)
Removing bad addon (‘addon name’)”

Although, the addons appear in the menu and it says theyre downloaded and enabled. But of course I can’t use them in game.