Sorry for the multiple postings. I tried to fix it and seems I made it worse.
First error below. I got this when I was in the Network Settings. I was looking for the Blog Template area, and the page reloaded while I was in the wrong area.
So then I got this error -
Fatal error: Cannot use string offset as an array in /home/XXXXXXXX/public_html/market/wp-content/plugins/marketpress/marketpress-includes/marketpress-ms.php on line 220
Trying to fix it, I copied over a clean version of the file, and I could get into the backend again. Doing that lost all my payment gateway settings so I tried to put them back in and the backend blew out and is now giving me the same error.