[18:52:05 ERROR] [Sponge]: Error occurred while executing command 'bp gen' for source EntityPlayerMP['Artai93'/284, l='world', x=-25076.61, y=56.00, z=7471.34]: net.minecraft.block.BlockAir cannot be cast to org.spongepowered.api.block.BlockState
java.lang.ClassCastException: net.minecraft.block.BlockAir cannot be cast to org.spongepowered.api.block.BlockState
        at org.spongepowered.common.data.persistence.LegacySchematicTranslator.translate(LegacySchematicTranslator.java:132) ~[LegacySchematicTranslator.class:1.12.2-7.1.5]
        at org.spongepowered.common.data.persistence.LegacySchematicTranslator.translate(LegacySchematicTranslator.java:60) ~[LegacySchematicTranslator.class:1.12.2-7.1.5]
        at Commands.Generate.loadSchem(Generate.java:66) ~[Generate.class:?]
        at Commands.Generate.execute(Generate.java:37) ~[Generate.class:?]
        at org.spongepowered.api.command.args.ChildCommandElementExecutor.execute(ChildCommandElementExecutor.java:255) ~[ChildCommandElementExecutor.class:1.12.2-7.1.5]
        at org.spongepowered.api.command.spec.CommandSpec.process(CommandSpec.java:388) ~[CommandSpec.class:1.12.2-7.1.5]
        at org.spongepowered.api.command.dispatcher.SimpleDispatcher.process(SimpleDispatcher.java:340) ~[SimpleDispatcher.class:1.12.2-7.1.5]
        at org.spongepowered.common.command.SpongeCommandManager.process(SpongeCommandManager.java:334) ~[SpongeCommandManager.class:1.12.2-7.1.5]
        at net.minecraft.command.ServerCommandManager.func_71556_a(SourceFile:1083) ~[dh.class:?]
        at net.minecraft.network.NetHandlerPlayServer.func_147361_d(SourceFile:855) ~[pa.class:?]
        at net.minecraft.network.NetHandlerPlayServer.func_147354_a(SourceFile:842) ~[pa.class:?]
        at net.minecraft.network.play.client.CPacketChatMessage.func_148833_a(SourceFile:37) ~[la.class:?]
        at net.minecraft.network.play.client.CPacketChatMessage.func_148833_a(SourceFile:9) ~[la.class:?]
        at org.spongepowered.common.event.tracking.phase.packet.PacketPhaseUtil.onProcessPacket(PacketPhaseUtil.java:193) ~[PacketPhaseUtil.class:1.12.2-7.1.5]
        at net.minecraft.network.PacketThreadUtil$1.redirect$onProcessPacket$zle000(SourceFile:539) ~[hv$1.class:?]
        at net.minecraft.network.PacketThreadUtil$1.run(SourceFile:13) ~[hv$1.class:?]
        at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) ~[?:1.8.0_201]
        at java.util.concurrent.FutureTask.run(Unknown Source) ~[?:1.8.0_201]
        at net.minecraft.util.Util.func_181617_a(SourceFile:46) ~[h.class:?]
        at org.spongepowered.common.SpongeImplHooks.onUtilRunTask(SpongeImplHooks.java:297) ~[SpongeImplHooks.class:1.12.2-7.1.5]
        at net.minecraft.server.MinecraftServer.redirect$onRun$zji000(SourceFile:4123) ~[MinecraftServer.class:?]
        at net.minecraft.server.MinecraftServer.func_71190_q(SourceFile:1581) ~[MinecraftServer.class:?]
        at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(SourceFile:349) ~[nz.class:?]
        at net.minecraft.server.MinecraftServer.func_71217_p(SourceFile:560) ~[MinecraftServer.class:?]
        at net.minecraft.server.MinecraftServer.run(SourceFile:464) ~[MinecraftServer.class:?]
        at java.lang.Thread.run(Unknown Source) [?:1.8.0_201]
>