root@vps:/home/minecraft# java -Xms4096M -Xmx4096M -jar /home/minecraft/spigot-1.13.2.jar
Exception in thread "main" java.lang.UnsupportedClassVersionError: org/bukkit/craftbukkit/Main : Unsupported major.minor version 52.0
        at java.lang.ClassLoader.defineClass1(Native Method)
        at java.lang.ClassLoader.defineClass(ClassLoader.java:808)
        at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
        at java.net.URLClassLoader.defineClass(URLClassLoader.java:443)
        at java.net.URLClassLoader.access$100(URLClassLoader.java:65)
        at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
        at java.net.URLClassLoader$1.run(URLClassLoader.java:349)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:348)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:430)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:323)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:363)
        at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:482)