enable_frinction is usable with ent_move.

phent_setfriction is usable with the Physics Engine.

You cannot mix these function....either use enable_friction and dont' register you object with the physics engine OR use phent_setfriction, which would require you register with teh physics engine, but you lose on any collision detection events; can't use any triggering or any enable commands refering to ent_move if registered with the physics engine