In order to help you troubleshoot your issue, we're going to need a bit more information pertaining to the error(s) you are experiencing.
- If you have full root access to your server, SSH into the root directory of your Flarum installation, edit the config.php file, and set
'debug' => true,. Then, reload the page and try again. Within that same error message (if it appears again), there should be newly added text that says DEBUG. Click on it and post the contents of the descriptive error it produces in this discussion. Sometimes enabling and disabling debug mode can also fix this issue you are having.
- If you were able to SSH into the root directory of your Flarum installation, run the following command and post the results of
php flarum info. We generally can use the extra information that this command produces.
Thank you for your time and patience!