ProTab 1.8 Error

[00:21:27] [Server thread/ERROR]: Error occurred while enabling ProTab v1.0.3 (Is it up to date?)
java.lang.AbstractMethodError
	at de.mail.j94.bastian.ProTab.ProTab.onEnable(ProTab.java:37) ~[?:?]
	at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:321) ~[spigot.jar:git-Spigot-b8f6402-a646500]
	at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:335) [spigot.jar:git-Spigot-b8f6402-a646500]
	at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:405) [spigot.jar:git-Spigot-b8f6402-a646500]
	at org.bukkit.craftbukkit.v1_8_R1.CraftServer.loadPlugin(CraftServer.java:352) [spigot.jar:git-Spigot-b8f6402-a646500]
	at org.bukkit.craftbukkit.v1_8_R1.CraftServer.enablePlugins(CraftServer.java:313) [spigot.jar:git-Spigot-b8f6402-a646500]
	at net.minecraft.server.v1_8_R1.MinecraftServer.q(MinecraftServer.java:402) [spigot.jar:git-Spigot-b8f6402-a646500]
	at net.minecraft.server.v1_8_R1.MinecraftServer.k(MinecraftServer.java:370) [spigot.jar:git-Spigot-b8f6402-a646500]
	at net.minecraft.server.v1_8_R1.MinecraftServer.a(MinecraftServer.java:325) [spigot.jar:git-Spigot-b8f6402-a646500]
	at net.minecraft.server.v1_8_R1.DedicatedServer.init(DedicatedServer.java:211) [spigot.jar:git-Spigot-b8f6402-a646500]
	at net.minecraft.server.v1_8_R1.MinecraftServer.run(MinecraftServer.java:494) [spigot.jar:git-Spigot-b8f6402-a646500]
	at java.lang.Thread.run(Unknown Source) [?:1.7.0_71]