The Roblox error 500 can be one of the indicators of an on-going server problem so what you have to do is to check the game’s server status.

This will take a few minutes, which can also give the website time to sort out any issues on the server side. If it's still not working, give it an hour and try again as developer's on the site ...

What is a 500 internal server error? How to fix the common message you receive when a website won't load ...

Anytime you see the “HTTP 500: “Internal Server Error” message in Roblox, you’re either trying to publish your game or make changes to it on the backend.

A 500 internal server error generally means that your server is unable to load a website and has come into a problem but can’t seem to source what the problem is.