
TO EVERYONE , I went to the App store and there was an update available, I updated the game and the Error Screen was gone.
Please find here the screenshots of the occurring error.
The first one shows the loading bars. Normally one one is visible. Since the update there is above the second one and after that bar is at 100% the error message appears.

The second screenshot showing the occurring error message. I think interesting is the message in small letters below the resign button. It seems to be like an error code. But I am not sure. 
In general it would be great to receive any feedback from plarium/raid officials. I mean I open a ticket at the support and also using this forum but up to now no official feedback is available. This is the technical support forum of plarium does any official read this and responding?
It would be nice if they take this issue seriously.