ah I solved the problem. It turns out that because I used the hack map program to explore quicker, it replaced some recipe slots by npc commands. Well, better remember this carefully. Anw, thank you!
Another problem: in chapter 6, how can I steal from Xana? I think that I read somewhere telling to wait for his HP down to 35% for him to transform, but after I waited him regaining his health a little, he disappeared. I couldn't found him, even using HM to check all the map. Also, his life displayed in the top north corner box is full again. This is surely a bug, but Aero closed the bug threat before so I mention it here