Mecanim player detection problem

Hello,

I was using the old animation system of unity and everything was running smoothly but when I changed to mecanim. The animations runs well but the problem is that my main camera no longer find the player and the enemy no longer sees him too ( I am using LineCast). Can anyone help me. I am using a character controller. Even with a rigid body and a capsule collider it's not working.

Can someone help me, thank you so much.