Welcome to the community!
Generally, we would advise clearing data from the application or uninstalling it and then reinstalling the application, as it is third party we are limited to what we can suggest to try.
However, taking a look and the Google Play store and the reviews for this application it appears this is a wide spread issue and most users on an android operating system are finding they are unable to open or use this application.
This is something the developers of this particular application would need to resolve.
If you do still want to attempt to clear data from the application simply go to settings > apps > beIN Connect > storage > clear data
Good luck 
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