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This looks like a PHP error, you would need to start with checking your logs. On Ubuntu by default the PHP errors should be available at the Apache error log. You could find out the last errors by running this command:
tail -30 /var/log/apache2/error.log
This should give you enough information to start your troubleshooting.
Feel free to share the logs here as well if you are not sure.
Regards,
Bobby
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