Running Unit Test Fails With ClassFormatError

Hi, 

I just updated to Intellij Idea 2017.2.4 and when I try to run a unit test, I get the following error message now:

Error:Internal error: (java.lang.ClassFormatError) org/jetbrains/jps/model/serialization/library/JpsLibraryTableSerializer
java.lang.ClassFormatError: org/jetbrains/jps/model/serialization/library/JpsLibraryTableSerializer
at org.jetbrains.jps.model.serialization.JpsGlobalLoader$GlobalLibrariesSerializer.loadExtension(JpsGlobalLoader.java:142)
at org.jetbrains.jps.model.serialization.JpsGlobalLoader$GlobalLibrariesSerializer.loadExtension(JpsGlobalLoader.java:135)
at org.jetbrains.jps.model.serialization.JpsLoaderBase.loadComponents(JpsLoaderBase.java:62)
at org.jetbrains.jps.model.serialization.JpsGlobalLoader.loadGlobalComponents(JpsGlobalLoader.java:97)
at org.jetbrains.jps.model.serialization.JpsGlobalLoader.load(JpsGlobalLoader.java:87)
at org.jetbrains.jps.model.serialization.JpsGlobalLoader.loadGlobalSettings(JpsGlobalLoader.java:61)
at org.jetbrains.jps.model.serialization.impl.JpsSerializationManagerImpl.loadModel(JpsSerializationManagerImpl.java:38)
at org.jetbrains.jps.cmdline.JpsModelLoaderImpl.loadModel(JpsModelLoaderImpl.java:45)
at org.jetbrains.jps.cmdline.BuildRunner.load(BuildRunner.java:79)
at org.jetbrains.jps.cmdline.BuildSession.runBuild(BuildSession.java:267)
at org.jetbrains.jps.cmdline.BuildSession.run(BuildSession.java:125)
at org.jetbrains.jps.cmdline.BuildMain$MyMessageHandler.lambda$channelRead0$0(BuildMain.java:236)
at org.jetbrains.jps.service.impl.SharedThreadPoolImpl.lambda$executeOnPooledThread$0(SharedThreadPoolImpl.java:42)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)

I tried reimporting my project but no luck.  

Any help would be greatly appreciated!

Ben