An application-internal exception has occurred

I tried running my Windows Phone 8.1 XAML App, but it does not get past this exception:

Unhandled exception at 0x75B20D83 (TWINAPI.APPCORE.DLL) in Neomilano.WindowsPhone.exe: 0xC000027B: An application-internal exception has occurred (parameters: 0x0300E460, 0x00000001).

I don't know what causes this. Maybe some of you do. I'll add details if needed.

Any help?

UPDATE: If it helps, here's what's on the output window.