Guns now showing Errors (Use to work for me)

[Commander Fi5h]

Hello everyone, recently for christmas, i was given a new computer, and i re-installed garrysmod, and everything seems to be working, exept for the guns on fearless. When i use to go on, and use a gun it would work fine for me, but now it comes up with errors, and it really annoys me!

Please can someone help me out, because i didn't use to do this, and i have re-installed garrys mod and it is not working anymore!