iOS application built with sencha architect does not install

Hello,

I built an iOS application on a Mac. So far so good.

I also got the .ipa-file for installation. But every time I try to install it on an iOS-Device (iPad Mini iOS 8.1.1 or iPad iOS 8.0) it cancels installation and something like "application cannot be loaded" appears.

What further information do you need to help me?

Thank you.

iOS application built with sencha architect does not install