Compiling Error

Whenever I try and do so I’m greeted with this error.

Could not locate ‘GameData’ key in c:\program files (x86)\steam\steamapps\common\garrysmod\garrysmod\gameinfo.txt
Patching WVT material: maps/rp_basedef_v3_d/dev/dev_blendmeasure_wvt_patch

and just sticks there and doesn’t do anything.

the error is not really that important, all that its letting you know is that in your gameinfo.txt you don’t have GameData “path to .fgd” if yu want to ge rid of the error open the gameinfo.txt and add in GameData “path to .fgd” i.e in gmod it would be GameData “cfg/garrysmod.fgd” if the .fgd is in the cfg folder