I have try to generate an emptyworld use Emptyworld plugin and ManyWorlds but that not working, here the console log : Spoiler: Log /mw new build 0 emptyworld 09:49:53 [INFO] [MW] Using emptyworld 09:49:53 [INFO] [MW] Creating level build... (Expect Lag) 09:49:53 [INFO] Preparing level "build" 09:49:53 [NOTICE] Spawn terrain for level "build" is being generated in the background 09:49:53 [CRITICAL] Error: "Call to undefined method pocketmine\level\generator\normal\biome\PlainBiome::getColor()" (EXCEPTION) in "/EmptyWorld_v1.1.1.phar/src/aliuly/emptyworld/WorldGen" at line 78 09:49:53 [CRITICAL] Error: "Call to undefined method pocketmine\level\generator\normal\biome\PlainBiome::getColor()" (EXCEPTION) in "/EmptyWorld_v1.1.1.phar/src/aliuly/emptyworld/WorldGen" at line 78 09:49:53 [CRITICAL] Error: "Call to undefined method pocketmine\level\generator\normal\biome\PlainBiome::getColor()" (EXCEPTION) in "/EmptyWorld_v1.1.1.phar/src/aliuly/emptyworld/WorldGen" at line 78 09:49:53 [CRITICAL] Error: "Call to undefined method pocketmine\level\generator\normal\biome\PlainBiome::getColor()" (EXCEPTION) in "/EmptyWorld_v1.1.1.phar/src/aliuly/emptyworld/WorldGen" at line 78 09:49:53 [CRITICAL] Error: "Call to undefined method pocketmine\level\generator\normal\biome\PlainBiome::getColor()" (EXCEPTION) in "/EmptyWorld_v1.1.1.phar/src/aliuly/emptyworld/WorldGen" at line 78 09:49:53 [CRITICAL] Error: "Call to undefined method pocketmine\level\generator\normal\biome\PlainBiome::getColor()" (EXCEPTION) in "/EmptyWorld_v1.1.1.phar/src/aliuly/emptyworld/WorldGen" at line 78 09:49:53 [CRITICAL] Error: "Call to undefined method pocketmine\level\generator\normal\biome\PlainBiome::getColor()" (EXCEPTION) in "/EmptyWorld_v1.1.1.phar/src/aliuly/emptyworld/WorldGen" at line 78 //09:49:53 [CRITICAL] Could not execute asynchronous task PopulationTask: Task crashed 09:49:53 [CRITICAL] Could not execute asynchronous task PopulationTask: Task crashed 09:49:53 [CRITICAL] Could not execute asynchronous task PopulationTask: Task crashed 09:49:53 [CRITICAL] Could not execute asynchronous task PopulationTask: Task crashed 09:49:53 [CRITICAL] Could not execute asynchronous task PopulationTask: Task crashed 09:49:53 [CRITICAL] Could not execute asynchronous task PopulationTask: Task crashed 09:49:53 [CRITICAL] Could not execute asynchronous task PopulationTask: Task crashed 09:49:53 [CRITICAL] Error: "Call to undefined method pocketmine\level\generator\normal\biome\PlainBiome::getColor()" (EXCEPTION) in "/EmptyWorld_v1.1.1.phar/src/aliuly/emptyworld/WorldGen" at line 78 09:49:53 [CRITICAL] Error: "Call to undefined method pocketmine\level\generator\normal\biome\PlainBiome::getColor()" (EXCEPTION) in "/EmptyWorld_v1.1.1.phar/src/aliuly/emptyworld/WorldGen" at line 78 09:49:53 [CRITICAL] Could not execute asynchronous task PopulationTask: Task crashed 09:49:53 [CRITICAL] Could not execute asynchronous task PopulationTask: Task crashed /
First thigs first, change the title to EmptyWorld plugin BUG because as I understand, the problem is with the plugin EmptyWorld.