End-users do not want to see `Internal Server Error` pages

As an ...

end-user

I want to ...

to be informed properly when resources are missing

So that ...

I do not have to guess what the "Internal Server Error" page means after clicking a location link on Twitter, for instance.

I know I'm done when ...

users are redirected to appropriate, "nice-looking" error pages when resources, such as locations, are not available.