Why is my weapon not showing in my FPS game?

[Xenosis]

I’m trying to add weapons to my FPS game, but I don’t know why it’s not working…

I’m follow this tutorial:

Prototype - adding hands and weapon

But it don’t show the weapon and I get a error message when i play…

[Xenosis]

This is the error I get when I play:

[Xenosis]

No one can see whats wrong?