HTTP 500 Error

You can always create the file locally and upload it via FTP:

In the File Manager, what you’re looking for is this symbol:

Right click → New File can also do the job.

If it’s the issue we’re suspecting, that won’t help at all, because no matter what website you create, it will end up being broken. To put it shortly, the issue we’re suspecting is that the volume you’re on might have a broken version of PHP that can’t execute anything. The test file will help verify that; if the test file works fine, then the PHP version isn’t broken, and you just need to troubleshoot the issue: