First of all, what tutorial are you talking about? Second of all if you turely implemented it correctly it is telling you that on line 607, 620, and 50 have errors in them, it tells you that you must define move_min_z (either plug in a number yourself or find where the tutorial gets this number and plug it in that way and skill 49 may need a personal plug in through behaviors or through the code with my.skill49 = "A certain value here" unless you tell us what tutorial your talking about we can't help you much.