World Crashes when generating structures with Chests

So I have been trying to figure out this for a couple weeks now. I can't seem to find a way to add chests to the structures when they generate. The structure generates just fine when I don't have chests but as soon as I add a chest it crashes. I get the following in my console when these structures try to generate.

[12:18:45 ERROR]: Encountered an unexpected exception net.minecraft.server.v1_12_R1.ReportedException: Exception ticking world at net.minecraft.server.v1_12_R1.MinecraftServer.D(MinecraftServer.java:908) ~[server.jar:git-Paper-1289] at net.minecraft.server.v1_12_R1.DedicatedServer.D(DedicatedServer.java:426) ~[server.jar:git-Paper-1289] at net.minecraft.server.v1_12_R1.MinecraftServer.C(MinecraftServer.java:767) ~[server.jar:git-Paper-1289] at net.minecraft.server.v1_12_R1.MinecraftServer.run(MinecraftServer.java:665) [server.jar:git-Paper-1289] at java.lang.Thread.run(Thread.java:748) [?:1.8.0_151] Caused by: java.lang.NoSuchMethodError: net.minecraft.server.v1_12_R1.TileEntity.a(Lnet/minecraft/server/v1_12_R1/NBTTagCompound;)V at com.minelazz.epicworldgenerator.nativeAPI.implementations.v1_12_R1.NMSImplementation.F(vc:11) ~[?:?] at com.minelazz.epicworldgenerator.structures.StructureObject.F(t:222) ~[?:?] at minelazz.iIIiIIIIIi.F(zn:526) ~[?:?] at minelazz.IiIiIIIIiI.recreateStructures(uc:371) ~[?:?] at net.minecraft.server.v1_12_R1.Chunk.a(Chunk.java:1050) ~[server.jar:git-Paper-1289] at net.minecraft.server.v1_12_R1.Chunk.loadNearby(Chunk.java:1025) ~[server.jar:git-Paper-1289] at net.minecraft.server.v1_12_R1.ChunkProviderServer.originalGetChunkAt(ChunkProviderServer.java:200) ~[server.jar:git-Paper-1289] at net.minecraft.server.v1_12_R1.ChunkProviderServer.getChunkAt(ChunkProviderServer.java:167) ~[server.jar:git-Paper-1289] at net.minecraft.server.v1_12_R1.PlayerChunk.a(PlayerChunk.java:121) ~[server.jar:git-Paper-1289] at net.minecraft.server.v1_12_R1.PlayerChunkMap.flush(PlayerChunkMap.java:179) ~[server.jar:git-Paper-1289] at net.minecraft.server.v1_12_R1.WorldServer.doTick(WorldServer.java:325) ~[server.jar:git-Paper-1289] at net.minecraft.server.v1_12_R1.MinecraftServer.D(MinecraftServer.java:897) ~[server.jar:git-Paper-1289] ... 4 more [12:18:45 ERROR]: Cause of unexpected exception was java.lang.NoSuchMethodError: net.minecraft.server.v1_12_R1.TileEntity.a(Lnet/minecraft/server/v1_12_R1/NBTTagCompound;)V at com.minelazz.epicworldgenerator.nativeAPI.implementations.v1_12_R1.NMSImplementation.F(vc:11) ~[?:?] at com.minelazz.epicworldgenerator.structures.StructureObject.F(t:222) ~[?:?] at minelazz.iIIiIIIIIi.F(zn:526) ~[?:?] at minelazz.IiIiIIIIiI.recreateStructures(uc:371) ~[?:?] at net.minecraft.server.v1_12_R1.Chunk.a(Chunk.java:1050) ~[server.jar:git-Paper-1289] at net.minecraft.server.v1_12_R1.Chunk.loadNearby(Chunk.java:1025) ~[server.jar:git-Paper-1289] at net.minecraft.server.v1_12_R1.ChunkProviderServer.originalGetChunkAt(ChunkProviderServer.java:200) ~[server.jar:git-Paper-1289] at net.minecraft.server.v1_12_R1.ChunkProviderServer.getChunkAt(ChunkProviderServer.java:167) ~[server.jar:git-Paper-1289] at net.minecraft.server.v1_12_R1.PlayerChunk.a(PlayerChunk.java:121) ~[server.jar:git-Paper-1289] at net.minecraft.server.v1_12_R1.PlayerChunkMap.flush(PlayerChunkMap.java:179) ~[server.jar:git-Paper-1289] at net.minecraft.server.v1_12_R1.WorldServer.doTick(WorldServer.java:325) ~[server.jar:git-Paper-1289] at net.minecraft.server.v1_12_R1.MinecraftServer.D(MinecraftServer.java:897) ~[server.jar:git-Paper-1289] at net.minecraft.server.v1_12_R1.DedicatedServer.D(DedicatedServer.java:426) ~[server.jar:git-Paper-1289] at net.minecraft.server.v1_12_R1.MinecraftServer.C(MinecraftServer.java:767) ~[server.jar:git-Paper-1289] at net.minecraft.server.v1_12_R1.MinecraftServer.run(MinecraftServer.java:665) [server.jar:git-Paper-1289] at java.lang.Thread.run(Thread.java:748) [?:1.8.0_151] [12:18:45 ERROR]: This crash report has been saved to: /var/www/minecraft/test/./crash-reports/crash-2018-01-14_12.18.45-server.txt [12:18:45 INFO]: Stopping server

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