Error in application

You start by posting:

• what iPhone model is involved
• what iOS version it is running, and
• what app is causing the error.

We can neither see nor touch your device, so cannot start to help without more information. Please help us help you by filling in the blanks.

Apple's recommendations for using the forums:

See this Apple article: If an app on your iPhone or iPad stops responding, closes unexpectedly, or won’t open

https://support.apple.com/en-ca/HT201398