|  참고사항

1. [질문 답변 게시판] 오류 문의를 하실 경우, 최대한 상황과 증상을 자세하게 설명해주세요.
2. [전체] 본문에 사진을 넣고자 한다면 아래에 파일 첨부를 눌러 사진을 선택해주세요.
3. [전체] 글을 올리실 때는 참고사항 내용을 모두 삭제하고 올리셔도 됩니다.

[15:30:55 WARN]: java.lang.NullPointerException

[15:30:55 WARN]:        at sun.reflect.GeneratedMethodAccessor45.invoke(Unknown Source)

[15:30:55 WARN]:        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)

[15:30:55 WARN]:        at java.lang.reflect.Method.invoke(Unknown Source)

[15:30:55 WARN]:        at JetPack.ItemStackUtils.getNBTString(ItemStackUtils.java:64)

[15:30:55 WARN]:        at JetPack.JetPackHandler.clickJetPack(JetPackHandler.java:222)

[15:30:55 WARN]:        at sun.reflect.GeneratedMethodAccessor67.invoke(Unknown Source)

[15:30:55 WARN]:        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)

[15:30:55 WARN]:        at java.lang.reflect.Method.invoke(Unknown Source)

[15:30:55 WARN]:        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:302)

[15:30:55 WARN]:        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)

[15:30:55 WARN]:        at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:499)

[15:30:55 WARN]:        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:484)

[15:30:55 WARN]:        at net.minecraft.server.v1_12_R1.PlayerConnection.a(PlayerConnection.java:1452)

[15:30:55 WARN]:        at net.minecraft.server.v1_12_R1.PacketPlayInEntityAction.a(SourceFile:43)

[15:30:55 WARN]:        at net.minecraft.server.v1_12_R1.PacketPlayInEntityAction.a(SourceFile:9)

[15:30:55 WARN]:        at net.minecraft.server.v1_12_R1.PlayerConnectionUtils$1.run(SourceFile:13)

[15:30:55 WARN]:        at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)

[15:30:55 WARN]:        at java.util.concurrent.FutureTask.run(Unknown Source)

[15:30:55 WARN]:        at net.minecraft.server.v1_12_R1.SystemUtils.a(SourceFile:46)

[15:30:55 WARN]:        at net.minecraft.server.v1_12_R1.MinecraftServer.D(MinecraftServer.java:747)

[15:30:55 WARN]:        at net.minecraft.server.v1_12_R1.DedicatedServer.D(DedicatedServer.java:405)

[15:30:55 WARN]:        at net.minecraft.server.v1_12_R1.MinecraftServer.C(MinecraftServer.java:678)

[15:30:55 WARN]:        at net.minecraft.server.v1_12_R1.MinecraftServer.run(MinecraftServer.java:576)

[15:30:55 WARN]:        at java.lang.Thread.run(Unknown Source)

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서버 버전:CraftBukkit version git-Spigot-99c2a37-9a82fa7 (MC: 1.12) (Implementing API version 1.12-R0.1-SNAPSHOT)

마인크래프트 버전: 1.12

 플러그인 (11): PermissionsEx, Shopkeepers, Vault, JetPack, Essentials, EssentialsProtect, EssentialsSpawn, EssentialsChat, EssentialsGeoIP, EssentialsAntiBuild, EssentialsXMPP

OS:윈도우10

위에 오류가 뜨는데 뜨는 이유가 뭘까요? ㅠ