I've recently downloaded a custom map, called Silent Sands. It's really cool in my opinion but I have some issues with that. I play with someone on LAN. I purchased Minecraft she didn't. (She uses the TeamExtreme launcher.) When we get to the pyramid and she spawns a horse my Minecraft crashes. (She's the server host by the way.) In a regular singleplayer map it doesn't crashes. It says something about API and unstability. What is the problem?
Silent Sands Crashes