Measurement application not working

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

If an app on your iPhone or iPad stops responding, closes unexpectedly or won’t open – Apple Support (UK)

Scroll down to Get more help:

• If the App Store itself is not responding, contact Apple Support for your iPhone or for your iPad.
• If you found the app on the App Store, contact the app developer. If the app is made by Apple or came with your iPhone or iPad, contact Apple Support for your iPhone or for your iPad.