-------- The following exception was logged by the framework: 
         The exception was probalby handled properly. 
java.util.concurrent.ExecutionException: java.lang.NullPointerException
	at java.util.concurrent.FutureTask$Sync.innerGet(FutureTask.java:222)
	at java.util.concurrent.FutureTask.get(FutureTask.java:83)
	at javax.swing.SwingWorker.get(SwingWorker.java:582)
	at org.processmining.framework.plugin.ProMFuture.get(ProMFuture.java:119)
	at org.processmining.framework.plugin.impl.AbstractPluginDescriptor$1.done(AbstractPluginDescriptor.java:180)
	at org.processmining.framework.plugin.ProMFuture$1.done(ProMFuture.java:66)
	at javax.swing.SwingWorker$5.run(SwingWorker.java:717)
	at javax.swing.SwingWorker$DoSubmitAccumulativeRunnable.run(SwingWorker.java:814)
	at sun.swing.AccumulativeRunnable.run(AccumulativeRunnable.java:95)
	at javax.swing.SwingWorker$DoSubmitAccumulativeRunnable.actionPerformed(SwingWorker.java:824)
	at javax.swing.Timer.fireActionPerformed(Timer.java:291)
	at javax.swing.Timer$DoPostEvent.run(Timer.java:221)
	at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:677)
	at java.awt.EventQueue.access$000(EventQueue.java:85)
	at java.awt.EventQueue$1.run(EventQueue.java:638)
	at java.awt.EventQueue$1.run(EventQueue.java:636)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)
	at java.awt.EventQueue.dispatchEvent(EventQueue.java:647)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:296)
	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:211)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:201)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:196)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:188)
	at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)
Caused by: java.lang.NullPointerException
	at org.processmining.plugins.abstractions.patterns.MinePatterns.encodeLog(MinePatterns.java:135)
	at org.processmining.plugins.abstractions.patterns.MinePatterns.<init>(MinePatterns.java:104)
	at org.processmining.plugins.abstractions.visualization.PatternAbstractionFrame.<init>(PatternAbstractionFrame.java:135)
	at org.processmining.plugins.abstractions.PatternAbstractionsPlugin.patternAbstractions(PatternAbstractionsPlugin.java:39)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at org.processmining.framework.plugin.impl.PluginDescriptorImpl.execute(PluginDescriptorImpl.java:237)
	at org.processmining.framework.plugin.impl.AbstractPluginDescriptor$1.doInBackground(AbstractPluginDescriptor.java:144)
	at org.processmining.framework.plugin.ProMFuture$1.doInBackground(ProMFuture.java:56)
	at javax.swing.SwingWorker$1.call(SwingWorker.java:277)
	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
	at java.util.concurrent.FutureTask.run(FutureTask.java:138)
	at javax.swing.SwingWorker.run(SwingWorker.java:316)
	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
	at java.lang.Thread.run(Thread.java:680)
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