Attempting to make plane, suddenly Easy Weld tool doesn't work

So I’m attempting to build a plane as stated in the title, but when I go to easy weld a control surface to the wing, it just get this:
[gamemodes\sandbox\entities\weapons\gmod_tool\shared.lua:150] attempt to call method ‘GetInfo’ (a nil value)

Can anyone tell me how to resolve this absolutely irritating problem?

Wow, don’t everyone jump in at once…