Another FS in my GM if it's possible

I would like to put also another filterscript in my gamemode.
This is an animation system script https://github.com/SoNikMells/aview/...ster/aview.pwn

I've already tried to put it in my gamemode, without changing anything, but the problem is:
when I type /anim in game, the script doesn't work correctly; the command works but the animation window appears incorrect, and it is impossible to use it.
However, if I leave it as filterscript, it works correctly.

What is the problem???