Running a private server with Valhalla and I have one player who the map crashes on load for constantly, and she has to delete the mod from her mods folder and reinstall every time she logs in to play.

The error received doesn't mention the map but after troubleshooting we discovered that IS the mod that needs reinstalled to get in.

Here is the error received: http://i.imgur.com/Z2NFc3G.png

What can we do to fix this?