Problem/Bug SignColors v0.6 error in console

So this is the error that appears in the console every 10 seconds in the console when someone's on the server.

Code:

[16:25:57 ERROR]: Could not pass event BlockPlaceEvent to SignColors v0.6
org.bukkit.event.EventException
    at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:310) ~[spigot-1.8.7-R0.1-SNAPSHOT-latest.jar:git-Spigot-f928e7a-994b2aa]
    at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[spigot-1.8.7-R0.1-SNAPSHOT-latest.jar:git-Spigot-f928e7a-994b2aa]
    at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:502) [spigot-1.8.7-R0.1-SNAPSHOT-latest.jar:git-Spigot-f928e7a-994b2aa]
    at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:487) [spigot-1.8.7-R0.1-SNAPSHOT-latest.jar:git-Spigot-f928e7a-994b2aa]
    at org.bukkit.craftbukkit.v1_8_R3.event.CraftEventFactory.callBlockPlaceEvent(CraftEventFactory.java:126) [spigot-1.8.7-R0.1-SNAPSHOT-latest.jar:git-Spigot-f928e7a-994b2aa]
    at net.minecraft.server.v1_8_R3.ItemStack.placeItem(ItemStack.java:157) [spigot-1.8.7-R0.1-SNAPSHOT-latest.jar:git-Spigot-f928e7a-994b2aa]
    at net.minecraft.server.v1_8_R3.PlayerInteractManager.interact(PlayerInteractManager.java:503) [spigot-1.8.7-R0.1-SNAPSHOT-latest.jar:git-Spigot-f928e7a-994b2aa]
    at net.minecraft.server.v1_8_R3.PlayerConnection.a(PlayerConnection.java:736) [spigot-1.8.7-R0.1-SNAPSHOT-latest.jar:git-Spigot-f928e7a-994b2aa]
    at net.minecraft.server.v1_8_R3.PacketPlayInBlockPlace.a(PacketPlayInBlockPlace.java:52) [spigot-1.8.7-R0.1-SNAPSHOT-latest.jar:git-Spigot-f928e7a-994b2aa]
    at net.minecraft.server.v1_8_R3.PacketPlayInBlockPlace.a(PacketPlayInBlockPlace.java:1) [spigot-1.8.7-R0.1-SNAPSHOT-latest.jar:git-Spigot-f928e7a-994b2aa]
    at net.minecraft.server.v1_8_R3.PlayerConnectionUtils$1.run(SourceFile:13) [spigot-1.8.7-R0.1-SNAPSHOT-latest.jar:git-Spigot-f928e7a-994b2aa]
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [?:1.8.0_101]
    at java.util.concurrent.FutureTask.run(FutureTask.java:266) [?:1.8.0_101]
    at net.minecraft.server.v1_8_R3.SystemUtils.a(SystemUtils.java:19) [spigot-1.8.7-R0.1-SNAPSHOT-latest.jar:git-Spigot-f928e7a-994b2aa]
    at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:718) [spigot-1.8.7-R0.1-SNAPSHOT-latest.jar:git-Spigot-f928e7a-994b2aa]
    at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:367) [spigot-1.8.7-R0.1-SNAPSHOT-latest.jar:git-Spigot-f928e7a-994b2aa]
    at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:657) [spigot-1.8.7-R0.1-SNAPSHOT-latest.jar:git-Spigot-f928e7a-994b2aa]
    at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:560) [spigot-1.8.7-R0.1-SNAPSHOT-latest.jar:git-Spigot-f928e7a-994b2aa]
    at java.lang.Thread.run(Thread.java:745) [?:1.8.0_101]
Caused by: java.lang.NoSuchMethodError: org.bukkit.inventory.PlayerInventory.getItemInMainHand()Lorg/bukkit/inventory/ItemStack;
    at de.codehat.signcolors.listener.ColoredSignListener.onLastSignFix(ColoredSignListener.java:57) ~[?:?]
    at sun.reflect.GeneratedMethodAccessor621.invoke(Unknown Source) ~[?:?]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_101]
    at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_101]
    at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:306) ~[spigot-1.8.7-R0.1-SNAPSHOT-latest.jar:git-Spigot-f928e7a-994b2aa]
    ... 18 more

 

@maks244
The issue is that you are using 1.8 server. For most new plugins, 1.8 is no longer supported. If you are on 1.8 because of the combat change in 1.9, there are tons of plugins out there that revert the system to pre-1.9 while being lightweight. Not only that, but there are a lot of other reason why not to be on 1.8 anymore. Please read this thread and update your server.

There is no other way around this. Either remove your plugin or update your server.

 

Update my server? geez. The plugins are not going to work if I update to 1.9 right? or will they. If I would need to update all of my plugins then that would take like 2 months...

 

They will work, as long as they don't use NMS code. If you are using a plugin that wasn't from a request, most would use Relfection, so you'd be fine. The error you are getting is directly related to the 1.9 Main Hand and Off-Hand.

Code:

java.lang.NoSuchMethodError: org.bukkit.inventory.PlayerInventory.getItemInMainHand()

 

dude, I don't even know what NMS code is. but ok I'll try to update my server to 1.9
EDIT: 1.9 or 1.9.4? will they work the same but with less bugs?

 

@maks244
Most plugins are forward compatible, because spigot normally adds things instead of removing them, so none of your plugins should break. Even if you do run into problems, all you need to do is change a few imports from "....1.8_r1...." to "...1.X_...."

 

changed it to 1.9.4 and literally everything is broken... i hope that i have a backup of my server
EDIT: my hosting site is now broken too

 

Post a server log using http://pastebin.com/ so we can diagnose your problems.

 

@maks244
Don't go back just yet. We still can help you. If you post your console, will be able to address any errors you get. If you can, post the full error log by copying the text from the "<server>/logs/recent.txt" file.

As for your server, what did you do to update your server? How exactly is it broken?

 

I didn't have a backup so I changed the engine back to 1.8.7 and everything started working again.
I changed the engine through my hosting site wich I did before with no problems.
When I joined the server my permissions plugin (group manager) was broken (you would get no permissions at all)
All of the text in the chat, signs, fonts, were just blocks like this: http://imgur.com/a/cs2Tk
But instead of this happening on the main screen it happened on my server.
My teleporting signs were broken.
All of my skins from the citizens plugin were gone.
My hub items that when clicked you would get a menu didn't work.
My holograms disappeared.
Probably a lot of other things were broken too but I just wanted to go back to not mess up anything.

My 1.8.7 (working) log: http://pastebin.com/9UEYvq30

My 1.9.4 (broken) log: http://pastebin.com/xs8sL5rt
once again, my hosting website froze for 5 minutes
EDIT: after refreshing the site what took 10 minutes the console was blank what never happened before.

I know that i already have a lot of errors in my working 1.8.7 version