Fitnesse for Appian

We have just started to get into fitnesse and I have been trying to get the example login script to work but it keeps throwing the below error on the TempoFixture. Does any one have any ideas on what is going on?

__EXCEPTION__:java.lang.UnsupportedClassVersionError: JVMCFRE003 bad major version; class=com/appiancorp/ps/automatedtest/fixture/TempoFixture, offset=6
	at java.lang.ClassLoader.defineClass(ClassLoader.java:364) [rt.jar:1.7.0]
	at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:154) [rt.jar:1.7.0]
	at java.net.URLClassLoader.defineClass(URLClassLoader.java:777) [rt.jar:1.7.0]
	at java.net.URLClassLoader.access$400(URLClassLoader.java:96) [rt.jar:1.7.0]
	at java.net.URLClassLoader$ClassFinder.run(URLClassLoader.java:1225) [rt.jar:1.7.0]
	at java.security.AccessController.doPrivileged(AccessController.java:366) [rt.jar:1.7.0]
	at java.net.URLClassLoader.findClass(URLClassLoader.java:660) [rt.jar:1.7.0]
	at java.lang.ClassLoader.loadClassHelper(ClassLoader.java:942) [rt.jar:1.7.0]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:851) [rt.jar:1.7.0]
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:335) [rt.jar:1.7.0]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:827) [rt.jar:1.7.0]
	at java.lang.Class.forNameImpl(Native Method) [rt.jar:1.7.0]
	at java.lang.Class.forName(Class.java:199) [rt.jar:1.7.0]
	at fitnesse.slim.fixtureInteraction.DefaultInteraction.getClass(DefaultInteraction.java:57) [fitnesse-20160515-standalone.jar]
	at fitnesse.slim.fixtureInteraction.DefaultInteraction.searchPathsForClass(DefaultInteraction.java:40) [fitnesse-20160515-standalone.jar]
	at fitnesse.slim.fixtureInteraction.DefaultInteraction.createInstance(DefaultInteraction.java:20) [fitnesse-20160515-standalone.jar]
	at fitnesse.slim.SlimExecutionContext.create(SlimExecutionContext.java:48) [fitnesse-20160515-standalone.jar]
	at fitnesse.slim.StatementExecutor.create(StatementExecutor.java:84) [fitnesse-20160515-standalone.jar]
	at fitnesse.slim.instructions.MakeInstruction.executeInternal(MakeInstruction.java:26) [fitnesse-20160515-standalone.jar]
	at fitnesse.slim.instructions.Instruction.execute(Instruction.java:29) [fitnesse-20160515-standalone.jar]
	at fitnesse.slim.ListExecutor$Executive.executeStatement(ListExecutor.java:49) [fitnesse-20160515-standalone.jar]
	at fitnesse.slim.ListExecutor$Executive.executeStatements(ListExecutor.java:43) [fitnesse-20160515-standalone.jar]
	at fitnesse.slim.ListExecutor.execute(ListExecutor.java:85) [fitnesse-20160515-standalone.jar]
	at fitnesse.slim.SlimServer.executeInstructions(SlimServer.java:84) [fitnesse-20160515-standalone.jar]
	at fitnesse.slim.SlimServer.processOneSetOfInstructions(SlimServer.java:77) [fitnesse-20160515-standalone.jar]
	at fitnesse.slim.SlimServer.tryProcessInstructions(SlimServer.java:64) [fitnesse-20160515-standalone.jar]
	at fitnesse.slim.SlimServer.serve(SlimServer.java:49) [fitnesse-20160515-standalone.jar]
	at fitnesse.slim.SlimService.handle(SlimService.java:154) [fitnesse-20160515-standalone.jar]
	at fitnesse.slim.SlimService.acceptOne(SlimService.java:162) [fitnesse-20160515-standalone.jar]
	at fitnesse.slim.SlimService.accept(SlimService.java:124) [fitnesse-20160515-standalone.jar]
	at fitnesse.slim.SlimService.startWithFactory(SlimService.java:76) [fitnesse-20160515-standalone.jar]
	at fitnesse.slim.SlimService.main(SlimService.java:56) [fitnesse-20160515-standalone.jar]