Please fix this apple

For about a year now this app has been working well, until NOW...... When I press the play button it does not play or make any sound and the top monitor is not playing and all you see is black!! Im really upset because this app has helped me so much in the past and now I dont know what to do. Now I cant edit my videos for my YouTube channel and my viewers will get mad. I downloaded iMovie on another iPhone and it worked perfectly fine. I tureen off the phone and turned it back on. I uninstalled it and then reinstalled it and none of its working...... PLEASE HELP APPLE! I DONT LIKE YOUR APP CLIPS

URGENT PLEASE FIX THIS APPLE about iMovie, v2.2.3