i have tried almost everything and whats happening is i have a weapon that i want to animate and i took the m16.VMGun.mb and added it to  my scene then i selected the m16 mesh and detached the skin, i have also tried it when i didnt detach the skin and then i deleted the mesh, next i moved the joints around to match my weapon and then binded them to  my mesh but, then saved it as .VMGun file and then when i open the m16_animation.mb and then try to switch the current rig file and choose my weapon i get this damn error every time and when the scene doesnt have the m16 in it my gun will go in fine heres the error

// Error: This reference cannot be unloaded. Possibly items from another file are parented to items from this file.

i would really apreciate some help thanks