xcode ios App "The application could not be verified"

I'm developing a app with the latest xcode. I configured xcode to "don't sign" to install the app to my iphone without a developer account. It was working fine, until i updated my iphone 6 to ios 8.3.

I removed the app from the phone, restarted it, did a "clean"(in Build-Menu), but same error.

Also i havent changed the project settings in xcode.