Help Me! What is this

As my knowledge , The problem on rendering Player model , When player select team and spawn to the world server crash because server got incompatible model file to render ( Player model ) ,so in this case you are trying to use a model file doesn't fit with GoldSrc engine (Counter-Strike engine ) like Source:engine (Counter-Strike:Source) model file .

Solution:
- Try to change player model .

I hope the solution work !