Leaderboard Issue

I’m trying to assign the leaderboard (module) to the Simanswer frontpage. It turns out the frontpage can't display ( showing HTTP 500). The SimAnswer frontpage is linked to my Q & A menu item at Navigation bar in my homepage (you.daretry.com). After assigning the leaderboard module to the SimAnswer frontpage, the frontpage shows HTTP500 as you can see now. Please let me know how to fix this ASAP. This has been my third try to get answer on this issue. Thanks.