Message UI not working

Hello my I keep getting the message  UI not working how embarrassing  either exit or restart I have restarted and nothing , I tried fixing as suggested and it is still not working  I am unprotected

Hello Valerie.
We regret for the inconvenience caused. Please follow the steps in this link to resolve the user interface error.

Hello Valerie.
We regret for the inconvenience caused. Please follow the steps in this link to resolve the user interface error.