If anybody's been getting the smooth_turn error, it's now fixed, just a little problem in the script file:

//comment this out
//pf_smooth_turn(my, VECTOR(my._PF_PAN_TO_TARGET,0,0), turn_speed);

//new version
pf_smooth_turn(my, turn_speed,VECTOR(my._PF_PAN_TO_TARGET,0,0));