More information about this error may be available in the server error log.
That's the crucial part. You need to find the error log, because it contains the information you need to actually fix problem.
The location of the error log file is configured in the apache (and often in the virtual host) configuration file. On a Debian system it's typically /var/log/apache2/error.log or /var/log/apache2/yourdomain.tld/error.log
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