iMovie not working

My iMovie will not let me create a new movie. It is up to date with the latest app upgrade. I was starting a new video edit when the app crashed (which has happened a lot since the update). I went to open it again like usual and the project hadn't saved like normal. I went to click "New Movie" and after I gave it a title it prompted me with "this task can not be completed no further information is available." I literally need iMovie for college, my job, etc. Please help as Apple has been useless.