Ok, so I disabled all the plugins and tried to activate only the single sign on plugin and received the exact same error. So we can rule that out.
I have a question regarding what Onigoetz posted. Namely do I need to upload a brand new common.php file as “common.org.php”? So then both files would be in the root of phpbb or should there be only one of each?
Also, I have phpbb SEO forum installed (so it’s not just a vanilla PHPBB) and so I have a file named “common-org.php” in the root alongside “common.php” and it is working just fine.
I”m pretty new about this so I appreciate any in depth help you can give.
I had a REALLY hard time making wordpress and phpbb play nice in the first place and I want to avoid any future big problems. Thanks a ton for your help!