Whenever i try to open an app it says try again later and when i try again later it doesn't work still. How do i fix it?

What app are you trying to open? What OS are you using?

Was there some automatic or manual update to that app or to your OS?

No numbers or error codes? Does everything else work.

More information is needed.

However, try uninstalling and reinstalling the app. May have been corrupted.