I am running the script as the root user, so really do not understand where that error comes from. I added an error_log there to see what is happening. The error came from the install.php script from line 2000. It includes a mkdirtree command so I will now try to print out the path that is the value given there. ojs/Upgrade.inc.php at ojs-stable-3_1_0 · pkp/ojs · GitHub