1.12.2 Spigot bukkit error

[Evan-SY-Jung]

[NBTEditor] Enabling NBTEditor v3.0 [05:03:17] [Server thread/ERROR]: [NBTEditor] Error preparing reflection objects java.lang.NullPointerException: null at com.goncalomb.bukkit.mylib.reflect.BukkitReflect.prepareReflection(BukkitReflect.java:72) ~[nbteditor-3.0.jar:?] at com.goncalomb.bukkit.nbteditor.NBTEditor.onEnable(NBTEditor.java:71) [nbteditor-3.0.jar:?] at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:264) [JavaPlugin.class:git-CatServer-1.12.2-3440193] at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:328) [JavaPluginLoader.class:git-CatServer-1.12.2-3440193] at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:405) [SimplePluginManager.class:git-CatServer-1.12.2-3440193] at org.bukkit.craftbukkit.v1_12_R1.CraftServer.enablePlugin(CraftServer.java:436) [CraftServer.class:git-CatServer-1.12.2-3440193] at org.bukkit.craftbukkit.v1_12_R1.CraftServer.enablePlugins(CraftServer.java:384) [CraftServer.class:git-CatServer-1.12.2-3440193] at net.minecraft.server.MinecraftServer.func_71247_a(MinecraftServer.java:391) [MinecraftServer.class:?] at net.minecraft.server.dedicated.DedicatedServer.func_71197_b(DedicatedServer.java:327) [nz.class:?] at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:602) [MinecraftServer.class:?] at java.lang.Thread.run(Unknown Source) [?:1.8.0_221] [05:03:17] [Server thread/ERROR]: [NBTEditor] This version of NBTEditor is not compatible with this version of Bukkit

I used old (both 1.12) and newest (1.13) versions and those messages are keep poping up. I am using spigot server and it is 1.12.2.