Bukkit

What steps will reproduce the problem?
1.install the plugin
2. run the plugin
3. there it is

What is the expected output? What do you see instead?
nothing, but on the console

What version of the product are you using?
the latest

Do you have an error log of what happened?
[13:40:11] [Server thread/ERROR]: Could not pass event BlockPistonRetractEvent to Jobs v2.60.1
org.bukkit.event.EventException
    at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:305) ~[spigot_server.jar:git-Spigot-13716d9-0899683]
    at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[spigot_server.jar:git-Spigot-13716d9-0899683]
    at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:502) [spigot_server.jar:git-Spigot-13716d9-0899683]
    at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:487) [spigot_server.jar:git-Spigot-13716d9-0899683]
    at net.minecraft.server.v1_8_R1.BlockPiston.e(BlockPiston.java:72) [spigot_server.jar:git-Spigot-13716d9-0899683]
    at net.minecraft.server.v1_8_R1.BlockPiston.doPhysics(BlockPiston.java:44) [spigot_server.jar:git-Spigot-13716d9-0899683]
    at net.minecraft.server.v1_8_R1.BlockPistonExtension.doPhysics(SourceFile:177) [spigot_server.jar:git-Spigot-13716d9-0899683]
    at net.minecraft.server.v1_8_R1.World.d(World.java:583) [spigot_server.jar:git-Spigot-13716d9-0899683]
    at net.minecraft.server.v1_8_R1.World.applyPhysics(World.java:532) [spigot_server.jar:git-Spigot-13716d9-0899683]
    at net.minecraft.server.v1_8_R1.BlockRedstoneTorch.remove(BlockRedstoneTorch.java:75) [spigot_server.jar:git-Spigot-13716d9-0899683]
    at net.minecraft.server.v1_8_R1.Chunk.a(Chunk.java:512) [spigot_server.jar:git-Spigot-13716d9-0899683]
    at net.minecraft.server.v1_8_R1.World.setTypeAndData(World.java:392) [spigot_server.jar:git-Spigot-13716d9-0899683]
    at net.minecraft.server.v1_8_R1.BlockRedstoneTorch.b(BlockRedstoneTorch.java:120) [spigot_server.jar:git-Spigot-13716d9-0899683]
    at net.minecraft.server.v1_8_R1.WorldServer.a(WorldServer.java:633) [spigot_server.jar:git-Spigot-13716d9-0899683]
    at net.minecraft.server.v1_8_R1.WorldServer.doTick(WorldServer.java:238) [spigot_server.jar:git-Spigot-13716d9-0899683]
    at net.minecraft.server.v1_8_R1.MinecraftServer.z(MinecraftServer.java:741) [spigot_server.jar:git-Spigot-13716d9-0899683]
    at net.minecraft.server.v1_8_R1.DedicatedServer.z(DedicatedServer.java:316) [spigot_server.jar:git-Spigot-13716d9-0899683]
    at net.minecraft.server.v1_8_R1.MinecraftServer.y(MinecraftServer.java:623) [spigot_server.jar:git-Spigot-13716d9-0899683]
    at net.minecraft.server.v1_8_R1.MinecraftServer.run(MinecraftServer.java:526) [spigot_server.jar:git-Spigot-13716d9-0899683]
    at java.lang.Thread.run(Thread.java:745) [?:1.8.0_60]
Caused by: java.lang.NoSuchMethodError: org.bukkit.event.block.BlockPistonRetractEvent.getBlocks()Ljava/util/List;
    at com.gamingmesh.jobs.nmsUtil.v1_8.getPistonRetractBlocks(v1_8.java:16) ~[?:?]
    at com.gamingmesh.jobs.listeners.PistonProtectionListener.OnBlockRetractMove(PistonProtectionListener.java:113) ~[?:?]
    at sun.reflect.GeneratedMethodAccessor542.invoke(Unknown Source) ~[?:?]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_60]
    at java.lang.reflect.Method.invoke(Method.java:497) ~[?:1.8.0_60]
    at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:301) ~[spigot_server.jar:git-Spigot-13716d9-0899683]
    ... 19 more

Please provide any additional information below.
just run the plugin and didnt find the problem

What is your server exact version? As I cant reproduce this issue