Error whenever I pull out my tool gun

I get yellow text to the right part of my screen whenever i pull out my tool gun.

The text is: autorun/E2tool screen.lua:123: attempt to call upvalue
‘ViewModelDrawn’ (a nil value)

Its incredibly annoying and I have no idea whats going on nor am I good with computers.
Could anyone tell me whats going on and how to fix it?

Update your Wire mod.

SVN Tutorial: http://www.facepunch.com/showthread.php?t=688324

Ah, here is Divran with his mighty tutorial. His name is set in Chrome Dictionary for a reason.