Hey there, sorry you're having that trouble with the app. Whenever you run into trouble, we recommend closing the app. Then check for an update for the app to see if a new version is available. If so, download it and try reloading it after that update.
To see how to perform such updates, please review the appropriate link for your device.
Apple/iOS iPhone: https://support.apple.com/en-us/HT202180
Android: https://support.google.com/googleplay/answer/113412?hl=en
-John
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