App turned black and wont delete

This app was the best app for adding music. After about a week of use the app turned black. I cant open it even through the App Store. When I try the delete I hold it down, and it still jiggles and has the X in the corner but it wont delete. Im really mad because I love this app. And I still cant find anything that will fix it.

Apps45678 about Add music to videos!, v2.4