Everytime I download this app on my iPhone I tap on it and it doesn’t load. I’ve uninstalled and reinstalled several times and it doesn’t work. Give me some tips please.

Even though I have a valid subscription to the Antelope Valley Press, the application only accepts my login for 30 days. I then get a message that my subscription is invalid. The only way around this is for me to uninstall and reinstall the App. Nothing else works.