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    Take a look at this blog post on how to set up Grid2 https://goo.gl/rxzbE6. A user related (in the email group on the source) that using older selenium libs solves this exception.

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java.lang.NullPointerException: 	at com.google.common.base.Preconditions.checkNotNull(Preconditions.java:213)	at org.spongepowered.common.world.WorldManager.getWorldProperties(WorldManager.java:330)	at net.minecraftforge.common.DimensionManager.initDimension(DimensionManager.java:184)	at net.minecraft.server.MinecraftServer.func_71218_a(MinecraftServer.java:71)	at com.yurtmod.block.TileEntityTentDoor.onPlayerActivate(TileEntityTentDoor.java:156)	at com.yurtmod.block.BlockTentDoor.func_180639_a(BlockTentDoor.java:78)	at net.minecraft.server.management.PlayerInteractionManager.func_187251_a(PlayerInteractionManager.java:178)	at net.minecraft.network.NetHandlerPlayServer.redirect$onProcessRightClickBlock$0(NetHandlerPlayServer.java:636)	at net.minecraft.network.NetHandlerPlayServer.func_184337_a(NetHandlerPlayServer.java:679)	at net.minecraft.network.play.client.CPacketPlayerTryUseItemOnBlock.func_148833_a(SourceFile:55)	at net.minecraft.network.play.client.CPacketPlayerTryUseItemOnBlock.func_148833_a(SourceFile:11)	at org.spongepowered.common.network.PacketUtil.onProcessPacket(PacketUtil.java:118)	at net.minecraft.network.PacketThreadUtil$1.redirect$onProcessPacket$0(SourceFile:39)	at net.minecraft.network.PacketThreadUtil$1.run(SourceFile:13)	at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)	at java.util.concurrent.FutureTask.run(Unknown Source)	at net.minecraft.util.Util.func_181617_a(SourceFile:45)	at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:668)	at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:387)	at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:613)	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:471)	at java.lang.Thread.run(Unknown Source)