I am having issues starting up garrysmod. i get the hl2.exe error whenever i try to load up garrysmod. Im trying to access garrysmod through an external hard drive i have. Apparently i tested other games like Day of Defeat which managed to work fine. I already tried to fix my problem by copying my whole steam folder to my computer from my external hard drive and play it from there but didnt work. I then tried reinstalling it on my computer but it didnt do anything. So i deleted the copy of my steam that was on my computer because i already have it on my external hard drive. Help would be appreciated very much.
PLEASE HELP ME!