My Unity version is 3.5.5f3 (Free not Pro)
Alongside with the above image filters error I am also getting this one:
Error in file: C:/BuildAgent/work/…/Editor/MonoGenerated/Editor/EditorGUIUtility.cs at line: 330
Also, I cannot find the BuildAgent folder with visible hidden files and folders.
Thank you for all your answers 
I take it your fiddling in the FPS tutorial and replaced the gun with another model. (Thats what I did) Never the less I believe the problem is the model. In my case its the muzzle flash which doesn’t know where to draw. (so I think) Somehow the model (for you it may be any model) doesn’t have an understanding of a texture. Should give you the error if you compile it though. It didn’t with mine. I’ll update this when I figure out a fix.