Bukkit

After the world has been reset, the console shows this error:

12:08:47 SurvivalGames: Unloading world 'Raumschiff'... (SG1)
12:08:47 SurvivalGames: Unloading chunks...
12:08:47 SurvivalGames: 0 chunks unloaded.
12:08:47 Multiverse-Core: World 'SG1' was unloaded from memory.
12:08:47 SurvivalGames: World 'Raumschiff' unloaded. (SG1)
12:08:47 SurvivalGames: Extracting world region zip 'SG1/region.zip'...
12:08:47 SurvivalGames: Existing world region folder deleted.
12:08:47 SurvivalGames: Finished extracting world region zip 'SG1/region.zip' in 9ms.
12:08:47 SurvivalGames: Extracting world level zip 'SG1/level.dat.zip'...
12:08:47 SurvivalGames: Existing world level file deleted.
12:08:47 SurvivalGames: Finished extracting world level zip 'SG1/level.dat.zip' in 0ms.
12:08:47 SurvivalGames: Loading world 'SG1'...
12:08:47 CONSOLE: [INFO] GroupManager - INFO - New world detected...
12:08:47 CONSOLE: [INFO] GroupManager - INFO - Creating data for: SG1
12:08:47 CONSOLE: [INFO] GroupManager - INFO - Don't forget to configure/mirror this world in config.yml.
12:08:47 CONSOLE: [INFO] Preparing start region for level 4 (Seed: -7136403870852146607)
12:08:47 CONSOLE: WARN]: [SurvivalGames] Task #2129 for SurvivalGames v1.0.6-Alpha2 generated an exception
12:08:47 CONSOLE: must be positive
12:08:47 CONSOLE: Source) ~[?:1.7.0_40]
12:08:55 CONSOLE: [INFO] Stopping server

Spigot: #1190
SurvivalGames X: Survival Games X v1.0.6-Alpha2

I get this error too, If I use the command /hg enable

Hard to say what the error is without a proper error log. Seems to be crashing when the world has finished loading.