What's the best way to handle unexpected application errors?

1. What is the best way of handling error whenever an unexpected request is triggered?
2. What does unexpected application error mean?

What is the best way of handling error whenever an unexpected request is triggered?

using error events, and then, triggering following actions to handle the error according to the business logic. By using this approach, the whole process – including the treatment of the errors – is clear for all the personas involved in the project.

What does unexpected application error mean?

The Application Encountered an Unexpected Error. The error message is often due to a corrupt installation or the cache files of the application.