java.lang.UnsupportedClassVersionError: Bad version number in .class file

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Bad version number in .class file
java.lang.UnsupportedClassVersionError: Bad version number in .class file
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:620)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:260)
at java.net.URLClassLoader.access$100(URLClassLoader.java:56)
at java.net.URLClassLoader$1.run(URLClassLoader.java:195)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:268)
at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
at org.apache.tools.ant.AntClassLoader.findBaseClass(AntClassLoader.java:1197)
at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:242)
at org.apache.tools.ant.taskdefs.Definer.addDefinition(Definer.java:457)
at org.apache.tools.ant.taskdefs.Definer.execute(Definer.java:183)
at org.apache.tools.ant.taskdefs.Antlib.execute(Antlib.java:161)
at org.apache.tools.ant.Task.perform(Task.java:364)
at org.apache.tools.ant.taskdefs.Definer.loadAntlib(Definer.java:330)
at org.apache.tools.ant.taskdefs.Definer.execute(Definer.java:236)
at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:275)
at org.apache.tools.ant.Task.perform(Task.java:364)
at org.apache.tools.ant.Target.execute(Target.java:341)
at org.apache.tools.ant.helper.ProjectHelper2.parse(ProjectHelper2.java:142)
at org.apache.tools.ant.ProjectHelper.configureProject(ProjectHelper.java:91)
at org.apache.tools.ant.Main.runBuild(Main.java:653)
at org.apache.tools.ant.Main.startAnt(Main.java:187)
at org.apache.tools.ant.Main.start(Main.java:150)

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