eujjRener please follow the Troubleshooting guide https://docs.flarum.org/troubleshoot and tell us with which step you are having an issue.
Also please describe the steps that lead to the problem. Have you just finished installing Flarum, or did it work for a while before you encountered the error?
We could also use some details about your setup. How and why are you virtualizing? Are you accessing the website from within the VM as well or have you forwarded the website from the host or intranet? Or are you referring to a self-managed VPS in the cloud?
