Application oven

Hey i dont know if anyone can help me with this but im using gamemaker studio and they told me to use this application oven to create an ipa that i can put on my ipad so i can test the apps im making, but i dont know what im doing wrong when i press bake me an ipa it wont save even if i name it dwarfy or dwarfy.ipa, i dont know if my appid is wrong or what is wrong, hope someone can help me i will add a picture of the program.