Ok, so I open my Steam to play a bit of Garry’s Mod and I notice Garry’s Mod does not want to open, so I go the library and I see that it is updating. After it is done updating I open it up and I am greeted with the following error:
I am not sure if this is something I have caused but I am not sure what I need to due in order to solve it,
Also I have checked my processes and hl2.exe is not open.
Just kept clicking Garry’s Mod in the library and then it worked.