"Error" on top of model in HLMV?

[Leeous]

So I'm working on a SWEP model, it currently has no bones or animations. I compiled it to get an idea of how it'd look in-game but when I load it up with HLMV it shows a huge ass error on top of my model. In-game it is fine. Any idea what I've done wrong here? Should I just ignore it?

https://files.facepunch.com/forum/upload/273008/e155b783-1b2b-4cc5-b3b1-186e8d06dd83/image.png

https://files.facepunch.com/forum/upload/273008/e86cb837-c255-4479-a2bd-b9683edbf105/image.png