Marketpress that working with the MINIMAL theme! UGH!

I just paid for a new WordPress theme, and Marketpress is NOT working again! It’s causing the site to shut down and give this message: Fatal error: Cannot redeclare debugLog() (previously declared in /home/arttist/public_html/wp-content/themes/milo/inc/debug.php:4) in /home/arttist/public_html/wp-content/plugins/marketpress/includes/common/payment-gateways/_payway.php on line 473

When I deactivate Marketpress, the site works fine. How do I resolve this because I paid for this theme and I still want my clients to be able to shop! I’m frustrated because this happened before, and I had to use a theme that I didn’t like for my website just so the Marketpress could work. Now that I’ve paid for this, I need it to work, or I’m going to have to try another ecommerce option. :0(