Error adding NBT data to block

[YourMCAdmin]

Version 1.12
I'm using the unofficial fork.

It throws an error any time I attempt to add NBT data to a block. I'm trying to add data to a command block. This used to work in the past. No matter what I have after "add" it always throws an error. I've tried with and without the word Command. With and without the "/". With and without the "{" nothing works. Always throws an error.

My simple skript:

command /splash:
    trigger:
        set {_block} to location of block at player
        set block at player to command block
        wait 1 tick
        add "{Command:/summon Item ~ ~1 ~ {Item:{id:wooden_hoe,Count:1,tag:{display:{Name:""gun""}}}},TrackOutput:0}" to nbt of block at {_block}

The error:
[14:01:12] [Server thread/WARN]: [Skript] Error when parsing NBT - Expected value at: {Command:<--[HERE] [14:01:12] [Server thread/ERROR]: Could not pass event PlayerCommandPreprocessEvent to Skript v2.2-dev23 org.bukkit.event.EventException: null at com.destroystokyo.paper.event.executor.MethodHandleEventExecutor.execute(MethodHandleEventExecutor.java:37) ~[PaperSpigot-latest.jar:git-Paper-1255] at co.aikar.timings.TimedEventExecutor.execute(TimedEventExecutor.java:78) ~[PaperSpigot-latest.jar:git-Paper-1255] at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[PaperSpigot-latest.jar:git-Paper-1255] at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:515) ~[PaperSpigot-latest.jar:git-Paper-1255] at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:500) ~[PaperSpigot-latest.jar:git-Paper-1255] at net.minecraft.server.v1_12_R1.PlayerConnection.handleCommand(PlayerConnection.java:1463) ~[PaperSpigot-latest.jar:git-Paper-1255] at net.minecraft.server.v1_12_R1.PlayerConnection.a(PlayerConnection.java:1276) ~[PaperSpigot-latest.jar:git-Paper-1255] at net.minecraft.server.v1_12_R1.PacketPlayInChat.a(PacketPlayInChat.java:45) ~[PaperSpigot-latest.jar:git-Paper-1255] at net.minecraft.server.v1_12_R1.PacketPlayInChat.a(PacketPlayInChat.java:5) ~[PaperSpigot-latest.jar:git-Paper-1255] at net.minecraft.server.v1_12_R1.PlayerConnectionUtils.lambda$ensureMainThread$0(PlayerConnectionUtils.java:14) ~[PaperSpigot-latest.jar:git-Paper-1255] at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [?:1.8.0_141] at java.util.concurrent.FutureTask.run(FutureTask.java:266) [?:1.8.0_141] at net.minecraft.server.v1_12_R1.SystemUtils.a(SourceFile:46) [PaperSpigot-latest.jar:git-Paper-1255] at net.minecraft.server.v1_12_R1.MinecraftServer.D(MinecraftServer.java:843) [PaperSpigot-latest.jar:git-Paper-1255] at net.minecraft.server.v1_12_R1.DedicatedServer.D(DedicatedServer.java:426) [PaperSpigot-latest.jar:git-Paper-1255] at net.minecraft.server.v1_12_R1.MinecraftServer.C(MinecraftServer.java:767) [PaperSpigot-latest.jar:git-Paper-1255] at net.minecraft.server.v1_12_R1.MinecraftServer.run(MinecraftServer.java:665) [PaperSpigot-latest.jar:git-Paper-1255] at java.lang.Thread.run(Thread.java:748) [?:1.8.0_141] Caused by: java.lang.NoSuchMethodError: net.minecraft.server.v1_12_R1.TileEntity.a(Lnet/minecraft/server/v1_12_R1/NBTTagCompound;)V at me.TheBukor.SkStuff.util.NMS_v1_12_R1.setTileNBT(NMS_v1_12_R1.java:528) ~[?:?] at me.TheBukor.SkStuff.expressions.ExprNBTOf.change(ExprNBTOf.java:97) ~[?:?] at ch.njol.skript.effects.EffChange.execute(EffChange.java:273) ~[?:?] at ch.njol.skript.lang.Effect.run(Effect.java:54) ~[?:?] at ch.njol.skript.lang.TriggerItem.walk(TriggerItem.java:65) ~[?:?] at ch.njol.skript.lang.TriggerItem.walk(TriggerItem.java:93) ~[?:?] at ch.njol.skript.lang.Trigger.execute(Trigger.java:53) ~[?:?] at ch.njol.skript.command.ScriptCommand.execute2(ScriptCommand.java:222) ~[?:?] at ch.njol.skript.command.ScriptCommand.execute(ScriptCommand.java:184) ~[?:?] at ch.njol.skript.command.Commands.handleCommand(Commands.java:270) ~[?:?] at ch.njol.skript.command.Commands$1.onPlayerCommand(Commands.java:165) ~[?:?] at com.destroystokyo.paper.event.executor.MethodHandleEventExecutor.execute(MethodHandleEventExecutor.java:35) ~[PaperSpigot-latest.jar:git-Paper-1255] ... 17 more [14:01:12] [Server thread/WARN]: [Skript] Error when parsing NBT - Expected value at: {Command:<--[HERE] [14:01:12] [Server thread/ERROR]: null org.bukkit.command.CommandException: Unhandled exception executing command 'splash' in plugin Skript v2.2-dev23 at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46) ~[PaperSpigot-latest.jar:git-Paper-1255] at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:151) ~[PaperSpigot-latest.jar:git-Paper-1255] at org.bukkit.craftbukkit.v1_12_R1.CraftServer.dispatchCommand(CraftServer.java:676) ~[PaperSpigot-latest.jar:git-Paper-1255] at net.minecraft.server.v1_12_R1.PlayerConnection.handleCommand(PlayerConnection.java:1471) ~[PaperSpigot-latest.jar:git-Paper-1255] at net.minecraft.server.v1_12_R1.PlayerConnection.a(PlayerConnection.java:1276) ~[PaperSpigot-latest.jar:git-Paper-1255] at net.minecraft.server.v1_12_R1.PacketPlayInChat.a(PacketPlayInChat.java:45) ~[PaperSpigot-latest.jar:git-Paper-1255] at net.minecraft.server.v1_12_R1.PacketPlayInChat.a(PacketPlayInChat.java:5) ~[PaperSpigot-latest.jar:git-Paper-1255] at net.minecraft.server.v1_12_R1.PlayerConnectionUtils.lambda$ensureMainThread$0(PlayerConnectionUtils.java:14) ~[PaperSpigot-latest.jar:git-Paper-1255] at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [?:1.8.0_141] at java.util.concurrent.FutureTask.run(FutureTask.java:266) [?:1.8.0_141] at net.minecraft.server.v1_12_R1.SystemUtils.a(SourceFile:46) [PaperSpigot-latest.jar:git-Paper-1255] at net.minecraft.server.v1_12_R1.MinecraftServer.D(MinecraftServer.java:843) [PaperSpigot-latest.jar:git-Paper-1255] at net.minecraft.server.v1_12_R1.DedicatedServer.D(DedicatedServer.java:426) [PaperSpigot-latest.jar:git-Paper-1255] at net.minecraft.server.v1_12_R1.MinecraftServer.C(MinecraftServer.java:767) [PaperSpigot-latest.jar:git-Paper-1255] at net.minecraft.server.v1_12_R1.MinecraftServer.run(MinecraftServer.java:665) [PaperSpigot-latest.jar:git-Paper-1255] at java.lang.Thread.run(Thread.java:748) [?:1.8.0_141] Caused by: java.lang.NoSuchMethodError: net.minecraft.server.v1_12_R1.TileEntity.a(Lnet/minecraft/server/v1_12_R1/NBTTagCompound;)V at me.TheBukor.SkStuff.util.NMS_v1_12_R1.setTileNBT(NMS_v1_12_R1.java:528) ~[?:?] at me.TheBukor.SkStuff.expressions.ExprNBTOf.change(ExprNBTOf.java:97) ~[?:?] at ch.njol.skript.effects.EffChange.execute(EffChange.java:273) ~[?:?] at ch.njol.skript.lang.Effect.run(Effect.java:54) ~[?:?] at ch.njol.skript.lang.TriggerItem.walk(TriggerItem.java:65) ~[?:?] at ch.njol.skript.lang.TriggerItem.walk(TriggerItem.java:93) ~[?:?] at ch.njol.skript.lang.Trigger.execute(Trigger.java:53) ~[?:?] at ch.njol.skript.command.ScriptCommand.execute2(ScriptCommand.java:222) ~[?:?] at ch.njol.skript.command.ScriptCommand.execute(ScriptCommand.java:184) ~[?:?] at ch.njol.skript.command.ScriptCommand.onCommand(ScriptCommand.java:161) ~[?:?] at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[PaperSpigot-latest.jar:git-Paper-1255] ... 15 more [14:01:27] [Server thread/INFO]: YourMCAdmin issued server command: /sk reload mixer [14:01:32] [Server thread/INFO]: YourMCAdmin issued server command: /splash [14:01:32] [Server thread/INFO]: YourMCAdmin [bcb6f821-9d46-45cf-a4a0-d23572f52acb]: /splash [14:01:32] [Server thread/WARN]: [Skript] Error when parsing NBT - Expected value at: {Command:<--[HERE] [14:01:32] [Server thread/WARN]: [Skript] Task #50 for Skript v2.2-dev23 generated an exception java.lang.NoSuchMethodError: net.minecraft.server.v1_12_R1.TileEntity.a(Lnet/minecraft/server/v1_12_R1/NBTTagCompound;)V at me.TheBukor.SkStuff.util.NMS_v1_12_R1.setTileNBT(NMS_v1_12_R1.java:528) ~[?:?] at me.TheBukor.SkStuff.expressions.ExprNBTOf.change(ExprNBTOf.java:97) ~[?:?] at ch.njol.skript.effects.EffChange.execute(EffChange.java:273) ~[?:?] at ch.njol.skript.lang.Effect.run(Effect.java:54) ~[?:?] at ch.njol.skript.lang.TriggerItem.walk(TriggerItem.java:65) ~[?:?] at ch.njol.skript.lang.TriggerItem.walk(TriggerItem.java:93) ~[?:?] at ch.njol.skript.effects.Delay$1.run(Delay.java:84) ~[?:?] at org.bukkit.craftbukkit.v1_12_R1.scheduler.CraftTask.run(CraftTask.java:58) ~[PaperSpigot-latest.jar:git-Paper-1255] at org.bukkit.craftbukkit.v1_12_R1.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:356) [PaperSpigot-latest.jar:git-Paper-1255] at net.minecraft.server.v1_12_R1.MinecraftServer.D(MinecraftServer.java:833) [PaperSpigot-latest.jar:git-Paper-1255] at net.minecraft.server.v1_12_R1.DedicatedServer.D(DedicatedServer.java:426) [PaperSpigot-latest.jar:git-Paper-1255] at net.minecraft.server.v1_12_R1.MinecraftServer.C(MinecraftServer.java:767) [PaperSpigot-latest.jar:git-Paper-1255] at net.minecraft.server.v1_12_R1.MinecraftServer.run(MinecraftServer.java:665) [PaperSpigot-latest.jar:git-Paper-1255] at java.lang.Thread.run(Thread.java:748) [?:1.8.0_141]