Minecraft Forge 1.8.9 crash log

---- Minecraft Crash Report ----

*** ATTENTION: detected classes with unsupported format ***
*** DO NOT SUBMIT THIS CRASH REPORT TO FORGE ***

Contact authors of the following mods:
  Dynmap

// I bet Cylons wouldn't have this problem.

Time: 15/04/16 12:42 PM
Description: Exception in server tick loop

net.minecraftforge.fml.common.LoaderException: java.lang.ClassNotFoundException: org.dynmap.forge.DynmapMod
	at net.minecraftforge.fml.common.LoadController.transition(LoadController.java:162)
	at net.minecraftforge.fml.common.Loader.loadMods(Loader.java:543)
	at net.minecraftforge.fml.server.FMLServerHandler.beginServerLoading(FMLServerHandler.java:87)
	at net.minecraftforge.fml.common.FMLCommonHandler.onServerStart(FMLCommonHandler.java:320)
	at net.minecraft.server.dedicated.DedicatedServer.func_71197_b(DedicatedServer.java:112)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:441)
	at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.ClassNotFoundException: org.dynmap.forge.DynmapMod
	at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:191)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
	at net.minecraftforge.fml.common.ModClassLoader.loadClass(ModClassLoader.java:65)
	at java.lang.Class.forName0(Native Method)
	at java.lang.Class.forName(Class.java:278)
	at net.minecraftforge.fml.common.FMLModContainer.constructMod(FMLModContainer.java:468)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:606)
	at com.google.common.eventbus.EventSubscriber.handleEvent(EventSubscriber.java:74)
	at com.google.common.eventbus.SynchronizedEventSubscriber.handleEvent(SynchronizedEventSubscriber.java:47)
	at com.google.common.eventbus.EventBus.dispatch(EventBus.java:322)
	at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:304)
	at com.google.common.eventbus.EventBus.post(EventBus.java:275)
	at net.minecraftforge.fml.common.LoadController.sendEventToModContainer(LoadController.java:211)
	at net.minecraftforge.fml.common.LoadController.propogateStateMessage(LoadController.java:189)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:606)
	at com.google.common.eventbus.EventSubscriber.handleEvent(EventSubscriber.java:74)
	at com.google.common.eventbus.SynchronizedEventSubscriber.handleEvent(SynchronizedEventSubscriber.java:47)
	at com.google.common.eventbus.EventBus.dispatch(EventBus.java:322)
	at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:304)
	at com.google.common.eventbus.EventBus.post(EventBus.java:275)
	at net.minecraftforge.fml.common.LoadController.distributeStateMessage(LoadController.java:118)
	at net.minecraftforge.fml.common.Loader.loadMods(Loader.java:512)
	... 5 more
Caused by: java.lang.UnsupportedClassVersionError: org/dynmap/forge/DynmapMod : Unsupported major.minor version 52.0
	at java.lang.ClassLoader.defineClass1(Native Method)
	at java.lang.ClassLoader.defineClass(ClassLoader.java:800)
	at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
	at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:182)
	... 33 more


A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

-- System Details --
Details:
	Minecraft Version: 1.8.9
	Operating System: Linux (amd64) version 3.16.0-4-amd64
	Java Version: 1.7.0_95, Oracle Corporation
	Java VM Version: OpenJDK 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 774457064 bytes (738 MB) / 1029701632 bytes (982 MB) up to 1029701632 bytes (982 MB)
	JVM Flags: 2 total; -Xmx1024M -Xms1024M
	IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
	FML: MCP 9.19 Powered by Forge 11.15.1.1855 4 mods loaded, 4 mods active
	States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored
	UC	mcp{9.19} [Minecraft Coder Pack] (minecraft.jar)
	UC	FML{8.0.99.99} [Forge Mod Loader] (forge-1.8.9-11.15.1.1855-universal.jar)
	UC	Forge{11.15.1.1855} [Minecraft Forge] (forge-1.8.9-11.15.1.1855-universal.jar)
	UE	Dynmap{2.3-alpha-1-8} [Dynmap] (Dynmap-2.3-alpha-1-forge-1.8.9.jar)
	Loaded coremods (and transformers):
	Profiler Position: N/A (disabled)
	Is Modded: Definitely; Server brand changed to 'fml,forge'
	Type: Dedicated Server (map_server.txt)