I keep on getting this problem, what do I do?
 
	 
 
	The game is running. Please wait. 
	Exception in thread "main" java.lang.UnsupportedClassVersionError: joptsimple/OptionSpec : Unsupported major.minor version 51.0 
	    at java.lang.ClassLoader.defineClass1(Native Method) 
	    at java.lang.ClassLoader.defineClassCond(ClassLoader.java:637) 
	    at java.lang.ClassLoader.defineClass(ClassLoader.java:621) 
	    at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141) 
	    at java.net.URLClassLoader.defineClass(URLClassLoader.java:283) 
	    at java.net.URLClassLoader.access$000(URLClassLoader.java:58) 
	    at java.net.URLClassLoader$1.run(URLClassLoader.java:197) 
	    at java.security.AccessController.doPrivileged(Native Method) 
	    at java.net.URLClassLoader.findClass(URLClassLoader.java:190) 
	    at java.lang.ClassLoader.loadClass(ClassLoader.java:306) 
	    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301) 
	    at java.lang.ClassLoader.loadClass(ClassLoader.java:247) 
	Process ended with code: 1