From my understanding, the only way to avoid that animation crash is to first remove all of a player's weapons, then switch their class, then give them new weapons. In particular, if a player is a Heavy or Pyro and is switched to Sniper without their weapons being removed, the crash occurs.
I'll see about a small patch to fix this issue, if I can.
EDIT:
https://forums.alliedmods.net/showthread.php?p=2606929 will fix crash, but see main post for a link to a rewrite of this plugin
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Bread EOTL GunMettle Invasion Jungle Inferno will break everything. Don't even ask.
All plugins: Randomizer/GiveWeapon, ModelManager, etc.
Post in plugin threads with questions.
Steam is for playing games.
You
will be fed to javalia otherwise.
Psyduck likes replays.