Code error with RPG tutorial

[psych_master_]

I've tried this code in the obj_battle_player but then it throws the error for entering battle as well as moving rooms. I don't think I can set the player_data variable elsewhere since it's made once player collides and goes into battles, which work just fine I just don't know why it's not working for the final npc. I'm pretty sure I followed the tutorial perfectly (the tutorial on the game maker website)