Help! Some console error!

[Mr. Xero]

What's causing this error?

23.01 22:00:23 [Server] INFO ... 5 more
23.01 22:00:23 [Server] INFO at net.minecraft.server.v1_8_R3.SystemUtils.a(SourceFile:44) ~[spigot1.8.8.jar:git-Spigot-db6de12-18fbb24]
23.01 22:00:23 [Server] INFO at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[?:1.8.0_66]
23.01 22:00:23 [Server] INFO at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) ~[?:1.8.0_66]
23.01 22:00:23 [Server] INFO at net.minecraft.server.v1_8_R3.PlayerConnectionUtils$1.run(SourceFile:13) ~[spigot1.8.8.jar:git-Spigot-db6de12-18fbb24]
23.01 22:00:23 [Server] INFO at net.minecraft.server.v1_8_R3.PacketPlayInWindowClick.a(SourceFile:9) ~[spigot1.8.8.jar:git-Spigot-db6de12-18fbb24]
23.01 22:00:23 [Server] INFO at net.minecraft.server.v1_8_R3.PacketPlayInWindowClick.a(SourceFile:31) ~[spigot1.8.8.jar:git-Spigot-db6de12-18fbb24]
23.01 22:00:23 [Server] INFO at net.minecraft.server.v1_8_R3.PlayerConnection.a(PlayerConnection.java:1668) ~[spigot1.8.8.jar:git-Spigot-db6de12-18fbb24]
23.01 22:00:23 [Server] INFO at net.minecraft.server.v1_8_R3.Container.getSlot(Container.java:109) ~[spigot1.8.8.jar:git-Spigot-db6de12-18fbb24]
23.01 22:00:23 [Server] INFO at java.util.ArrayList.get(ArrayList.java:429) ~[?:1.8.0_66]
23.01 22:00:23 [Server] INFO at java.util.ArrayList.rangeCheck(ArrayList.java:653) ~[?:1.8.0_66]
23.01 22:00:23 [Server] INFO Caused by: java.lang.IndexOutOfBoundsException: Index: 49, Size: 45
23.01 22:00:23 [Server] INFO at java.lang.Thread.run(Thread.java:745) [?:1.8.0_66]
23.01 22:00:23 [Server] INFO at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:557) [spigot1.8.8.jar:git-Spigot-db6de12-18fbb24]
23.01 22:00:23 [Server] INFO at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:654) [spigot1.8.8.jar:git-Spigot-db6de12-18fbb24]
23.01 22:00:23 [Server] INFO at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:374) [spigot1.8.8.jar:git-Spigot-db6de12-18fbb24]
23.01 22:00:23 [Server] INFO at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:715) [spigot1.8.8.jar:git-Spigot-db6de12-18fbb24]
23.01 22:00:23 [Server] INFO at net.minecraft.server.v1_8_R3.SystemUtils.a(SourceFile:45) [spigot1.8.8.jar:git-Spigot-db6de12-18fbb24]
23.01 22:00:23 [Server] INFO at java.util.concurrent.FutureTask.get(FutureTask.java:192) ~[?:1.8.0_66]
23.01 22:00:23 [Server] INFO at java.util.concurrent.FutureTask.report(FutureTask.java:122) ~[?:1.8.0_66]
23.01 22:00:23 [Server] INFO java.util.concurrent.ExecutionException: java.lang.IndexOutOfBoundsException: Index: 49, Size: 45
23.01 22:00:23 [Server] FATAL Error executing task

 

[Neaza]

I think it can't find the jar file or it's not executable.

 

[IOJustin]

Make sure your plugins are up to date. And not conflicting with each other. My TIP is to uninstall plugins that you installed before this error popped up. I will look more into this error for you if that does not work.

 

[Mr. Xero]

Thanks guys! I've fixed the error!