Critical Error – WP Bakery not available after install

After installing Redux for the Furo Theme, my ability to edit on the backend of WP Bakery disappeared. Before installing it, I was unable to access my theme options (customzing the logo, colors, etc). After install I was able to access that feature, but as I said lost the ability to edit in WP Bakery.

The critical error I’m getting is : A PHP session was created by a session_start() function call. This interferes with REST API and loopback requests. The session should be closed by session_write_close() before making any HTTP requests.

The page I need help with: [log in to see the link]