Welcome to the forum
An error 500 most likely means your PHP code has crashed. In your dashboard, if you go to PHP options, you can turn on more verbose error messages

Other than that, this guide from admin might help:
Welcome to the forum
An error 500 most likely means your PHP code has crashed. In your dashboard, if you go to PHP options, you can turn on more verbose error messages

Other than that, this guide from admin might help: