Addons Not Appearing in Addons box help!

Hello, i had this problem for a while and i think its because of the update i don’t know but when i open GMOD (I have lots of addons) i check my addons and it say’s “Nothing Found” and all my maps are gone and when i try to install an addon it doesn’t work and i tried changing my download location and nothing works.

Delete your addon folder in garry’s mod. Launch garry’s mod and garry’s mod will reinstall that addon folder, but then you need to manual install all the maps again

[editline]9th July 2014[/editline]

And addons