Urgent request for help!

The app i have been developing on for over a month is suddenly unable to load into the IOS preview. The message is shown in the pic below:

The problem started suddenly in the middle of a work day. Otras applications load normally.

The application id is: 336020

We were scheduled to deliver the app in 4 days. We will be most appreciative if the problem can be looked at as soon as possible.

Thank you

Hey,

Is it possible that you have deleted the page that is set as the initial view? Firstly I would check the navigation tab to make sure everything is up to date there.