Ok, I wrote Hunger Games plugin. It works but today I get very strange problem. My plugin before every game unload the HG world, copy it and load it again. The problem is that bukkit can't unload the world. I really don't know why. I tried to unload it manually with My Worlds but it said: Failed to unload the world (main world or online players?) Ok, I'm sure. There are no players there... There are no loaded chunks or entities. I checked with Essentials: /lag command return: World "HG": 0 chunks, 0 entities. But I can't still unload it... I'm really confused... Any idea why I can't unload the world?