TS2771 i was using an app while the battery ran over, then when i recharged my ipod, i can no longer open that app anymore. Why?

i was using an app while the battery ran over, then when i recharged my ipod, i can no longer open that app anymore. Why?
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No idea why.
What have you tried to solve?
Have you tried the basics from the manual?
restart, reset, restore.
Have you tried removing the app, tehn adding it back?