ondraayyy & adagar thanks, sorry for late reply, I was out of town on weekends. I have tried to use the testfight, but still the same, can not login, so I am wondering if there is something wrong with my project, so I create a project use C2's template, it works, no crash on my ipad, even if I install through itunes. Now I really have no idea, as my project works fine on my android device, but no ios, so would you think it's the problem with my project? ondraayyy if you have time, I can download teamviewer, thanks for your help