A 500 error is a very general error that means there's a problem with the website displaying, but the details aren't readily available. Invalid .htaccess files, or invalid rules in them, commonly cause 500 errors with Linux hosting accounts (if that's what you have). You can try renaming your .htaccess file to disable it. That will let you know if it is the source of the problem. Otherwise, you can look at any error logs that are available to see what the root cause is. Hope that helps.
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