I am upgrading a site from Omeka 1.5 to 2.3 and getting this error when I attempt to "upgrade" to the new Contribution plugin.
I found an old thread talking about how to fix this in Omeka 2, by modifying the "background.php.path in the config.ini file" but Omeka 3 does not appear to HAVE a config.ini file--or at least I can't find it.
Any ideas how I configure the PHP path path to point to the right place?