Weird Glitch

Every time I try to open it it says something like "not the right format" or its reformatting and it wont work. It then quits the app and it doesnt matter what I do. Every time I click on it, it says the same thing. Ive used this app before with the iPad, but I have an iPhone 6s with the new update. If thats the case, please fix this!

SamiJay12$!1! about Manga Meow