MobSpawner52 Invalid Class: Unsupported major.minor version 51.0

[ImaLOSER]

C:\Users\HI\Desktop\Technic Server>java -Xincgc -Xmx3G -jar Tekkit.jar

Aliasing material 1 name: stone

Aliasing material 2 name: grass

Aliasing material 3 name: dirt

Aliasing material 4 name: stonebrick

Aliasing material 5 name: wood

Aliasing material 6 name: sapling

Aliasing material 7 name: bedrock

Aliasing material 8 name: water

Aliasing material 9 name: water

Aliasing material 10 name: lava

Aliasing material 11 name: lava

Aliasing material 12 name: sand

Aliasing material 13 name: gravel

Aliasing material 14 name: oreGold

Aliasing material 15 name: oreIron

Aliasing material 16 name: oreCoal

Aliasing material 17 name: log

Aliasing material 18 name: leaves

Aliasing material 19 name: sponge

Aliasing material 20 name: glass

Aliasing material 21 name: oreLapis

Aliasing material 22 name: blockLapis

Aliasing material 23 name: dispenser

Aliasing material 24 name: sandStone

Aliasing material 25 name: musicBlock

Aliasing material 26 name: bed

Aliasing material 27 name: goldenRail

Aliasing material 28 name: detectorRail

Aliasing material 29 name: pistonStickyBase

Aliasing material 30 name: web

Aliasing material 31 name: tallgrass

Aliasing material 32 name: deadbush

Aliasing material 33 name: pistonBase

Aliasing material 35 name: cloth

Aliasing material 37 name: flower

Aliasing material 38 name: rose

Aliasing material 39 name: mushroom

Aliasing material 40 name: mushroom

Aliasing material 41 name: blockGold

Aliasing material 42 name: blockIron

Aliasing material 43 name: stoneSlab

Aliasing material 44 name: stoneSlab

Aliasing material 45 name: brick

Aliasing material 46 name: tnt

Aliasing material 47 name: bookshelf

Aliasing material 48 name: stoneMoss

Aliasing material 49 name: obsidian

Aliasing material 50 name: torch

Aliasing material 51 name: fire

java.lang.UnsupportedClassVersionError: net/minecraft/server/TileEntityMobSpawne

r : Unsupported major.minor version 51.0

at java.lang.ClassLoader.defineClass1(Native Method)

at java.lang.ClassLoader.defineClassCond(Unknown Source)

at java.lang.ClassLoader.defineClass(Unknown Source)

at java.security.SecureClassLoader.defineClass(Unknown Source)

at java.net.URLClassLoader.defineClass(Unknown Source)

at java.net.URLClassLoader.access$000(Unknown Source)

at java.net.URLClassLoader$1.run(Unknown Source)

at java.security.AccessController.doPrivileged(Native Method)

at java.net.URLClassLoader.findClass(Unknown Source)

at java.lang.ClassLoader.loadClass(Unknown Source)

at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)

at java.lang.ClassLoader.loadClass(Unknown Source)

at net.minecraft.server.Block.<clinit>(Block.java:79)

at net.minecraft.server.StatisticList.a(SourceFile:117)

at net.minecraft.server.StatisticList.<clinit>(SourceFile:52)

at net.minecraft.server.MinecraftServer.main(MinecraftServer.java:589)

at org.bukkit.craftbukkit.Main.main(Main.java:134)

C:\Users\HI\Desktop\Technic Server>pause

Press any key to continue . . .

Just upgraded to tekkit2. How do I fix? Copy over class file from older tekkit.jar? IDK. Server refuses to start. Something wrong with mob spawn-er code.

[MR_LOL_HAX]

i got the same problem any help would be much appreciated...

i run a server and the players a begging for it to be setup but it wont work...

[ftsartek]

Yep same thing here.... Wondering if it's to do with OS? What are you guys on? I'm on Ubuntu server....

[ImaLOSER]

Nothing to do with the OS. Minecraft is strictly Java....and Java is an OS inside itself. Im stil trying to fine whats wrongs.....completely lost.

[ftsartek]

Yeah but ive had some weird bugs with Linux distro Java... Are you running with Java7 or 6?

[ImaLOSER]

Found the solution on another forum about java. I reinstalled jre7 and it worked! You cant use beta XD voi luoja!

[ftsartek]

Haha, nice, good work. Now just to get that to work on my server and BOOM

[Narath]

Hey everyone, im also having this issue but im not using Java 7. Any ideas? thanks

[Narath]

Nevermind, updated to Java 7 and problem resolved.

[RadioactiveCheese]

Same error, on a mac. No JRE7 available, any ideas?

[SpadgersHat]

Just tried this on both by macs. Very same error :(