root@panoramix:~/kompilace# java -jar BuildTools.jar
BuildTools
unconfigured@null.spigotmc.org
Pulling updates for /root/kompilace/Bukkit/.git
Successfully pulled updates!
Pulling updates for /root/kompilace/CraftBukkit/.git
Successfully pulled updates!
Pulling updates for /root/kompilace/Spigot/.git
Successfully pulled updates!
Pulling updates for /root/kompilace/BuildData/.git
Successfully pulled updates!
Final mapped jar: work/mapped.8eb82bde.jar does not exist, creating!
Loading mappings
0 packages, 1662 classes, 0 fields, 0 methods
Remapping final jar
Exception in thread "main" java.lang.UnsupportedClassVersionError: net/md_5/ss/SpecialSource : Unsupported major.minor version 51.0
        at java.lang.ClassLoader.defineClass1(Native Method)
        at java.lang.ClassLoader.defineClass(ClassLoader.java:643)
        at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
        at java.net.URLClassLoader.defineClass(URLClassLoader.java:277)
        at java.net.URLClassLoader.access$000(URLClassLoader.java:73)
        at java.net.URLClassLoader$1.run(URLClassLoader.java:212)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:205)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:323)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:268)
Could not find the main class: net.md_5.ss.SpecialSource. Program will exit.
Exception in thread "main" java.lang.RuntimeException: Error running command, return status !=0: java -jar BuildData/bin/SpecialSource-2.jar map -i work/mapped.8eb82bde.jar-cl -m BuildData/mappings/bukkit-1.8-members.csrg -o work/mapped.8eb82bde.jar-m
        at org.spigotmc.builder.Builder.runProcess(Builder.java:298)
        at org.spigotmc.builder.Builder.main(Builder.java:167)