Marketplace error broke backend

Fatal error: Cannot use string offset as an array in /home/XXXXXXX/public_html/market/wp-content/plugins/marketpress/marketpress-includes/marketpress-ms.php on line 220

I was in the Network Settings, looking for the place to change the New Users template. The page reloaded and I can now no longer get into the backend of the site.

Sorry to double-post