Multiverse main error log

[10:05:27] [Server thread/ERROR]: Error occurred while enabling Multiverse-Core v2.5-b692 (Is it up to date?)
java.lang.NoClassDefFoundError: net/minecraft/server/v1_7_R3/TileEntity
	at org.tilegames.hexicube.bukkit.isle.ChunkGen.getDefaultPopulators(ChunkGen.java:61) ~[?:?]
	at org.bukkit.craftbukkit.v1_8_R1.CraftServer.createWorld(CraftServer.java:892) ~[spigot.jar:git-Spigot-f234263-2db3ea2]
	at org.bukkit.Bukkit.createWorld(Bukkit.java:463) ~[spigot.jar:git-Spigot-f234263-2db3ea2]
	at org.bukkit.WorldCreator.createWorld(WorldCreator.java:261) ~[spigot.jar:git-Spigot-f234263-2db3ea2]
	at com.onarandombox.MultiverseCore.utils.WorldManager.doLoad(WorldManager.java:421) ~[?:?]
	at com.onarandombox.MultiverseCore.utils.WorldManager.doLoad(WorldManager.java:402) ~[?:?]
	at com.onarandombox.MultiverseCore.utils.WorldManager.doLoad(WorldManager.java:377) ~[?:?]
	at com.onarandombox.MultiverseCore.utils.WorldManager.loadWorlds(WorldManager.java:676) ~[?:?]
	at com.onarandombox.MultiverseCore.MultiverseCore.onEnable(MultiverseCore.java:306) ~[?:?]
	at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:321) ~[spigot.jar:git-Spigot-f234263-2db3ea2]
	at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:335) [spigot.jar:git-Spigot-f234263-2db3ea2]
	at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:405) [spigot.jar:git-Spigot-f234263-2db3ea2]
	at org.bukkit.craftbukkit.v1_8_R1.CraftServer.loadPlugin(CraftServer.java:355) [spigot.jar:git-Spigot-f234263-2db3ea2]
	at org.bukkit.craftbukkit.v1_8_R1.CraftServer.enablePlugins(CraftServer.java:315) [spigot.jar:git-Spigot-f234263-2db3ea2]
	at net.minecraft.server.v1_8_R1.MinecraftServer.q(MinecraftServer.java:402) [spigot.jar:git-Spigot-f234263-2db3ea2]
	at net.minecraft.server.v1_8_R1.MinecraftServer.k(MinecraftServer.java:370) [spigot.jar:git-Spigot-f234263-2db3ea2]
	at net.minecraft.server.v1_8_R1.MinecraftServer.a(MinecraftServer.java:325) [spigot.jar:git-Spigot-f234263-2db3ea2]
	at net.minecraft.server.v1_8_R1.DedicatedServer.init(DedicatedServer.java:211) [spigot.jar:git-Spigot-f234263-2db3ea2]
	at net.minecraft.server.v1_8_R1.MinecraftServer.run(MinecraftServer.java:494) [spigot.jar:git-Spigot-f234263-2db3ea2]
	at java.lang.Thread.run(Unknown Source) [?:1.7.0_60]
Caused by: java.lang.ClassNotFoundException: net.minecraft.server.v1_7_R3.TileEntity
	at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:91) ~[spigot.jar:git-Spigot-f234263-2db3ea2]
	at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:86) ~[spigot.jar:git-Spigot-f234263-2db3ea2]
	at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.7.0_60]
	at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.7.0_60]
	... 20 more