2018-03-13 17:51:37 DEBUG DefaultLinkingService:117 - before getLinkedObjects: node: 'ID'
2018-03-13 17:51:37 DEBUG DefaultLinkingService:123 - after getLinkedObjects: node: 'ID' result: ID
2018-03-13 17:51:37 DEBUG DefaultLinkingService:117 - before getLinkedObjects: node: 'ID'
2018-03-13 17:51:37 DEBUG DefaultLinkingService:123 - after getLinkedObjects: node: 'ID' result: ID
2018-03-13 17:51:37 DEBUG AbstractCleaningLinker:54 - doLinkModel took: 9ms
2018-03-13 17:51:37 DEBUG AbstractCleaningLinker:60 - afterModelLinked took: 0ms
2018-03-13 17:51:37 DEBUG OnChangeEvictingCache:285 - Clear 1 cache entries for resource Ace.xtext after 38 hits and 1 misses (quota: 97%)
2018-03-13 17:51:37 INFO  KeywordClusterProcess:188 - Start generating clusters ...
java.lang.IllegalArgumentException: Invalid range list at 2-last
2018-03-13 17:51:37 INFO  KeywordClusterProcess:304 - ... finished generating clusters.
	at weka.core.Range.setFlags(Range.java:319)
	at weka.core.Range.setUpper(Range.java:91)
	at weka.core.NormalizableDistance.initializeAttributeIndices(NormalizableDistance.java:300)
	at weka.core.NormalizableDistance.initialize(NormalizableDistance.java:292)
	at weka.core.NormalizableDistance.validate(NormalizableDistance.java:283)
	at weka.core.NormalizableDistance.distance(NormalizableDistance.java:420)
	at weka.core.NormalizableDistance.distance(NormalizableDistance.java:391)
	at weka.core.EuclideanDistance.distance(EuclideanDistance.java:144)
	at weka.clusterers.HierarchicalClusterer.getDistance0(HierarchicalClusterer.java:642)
	at weka.clusterers.HierarchicalClusterer.doLinkClustering(HierarchicalClusterer.java:521)
	at weka.clusterers.HierarchicalClusterer.buildClusterer(HierarchicalClusterer.java:334)
	at uk.ac.york.cs.ecss.analysis.grammaranalysis.learning.relation.KeywordClusterProcess.generateClusters(KeywordClusterProcess.java:252)
	at uk.ac.york.cs.ecss.analysis.grammaranalysis.learning.relation.KeywordClusterProcess.generateClusters(KeywordClusterProcess.java:346)
	at uk.ac.york.cs.ecss.analysis.grammaranalysis.learning.WekaXtextClusterGenerator.generate(WekaXtextClusterGenerator.java:108)
	at uk.ac.york.cs.ecss.analysis.grammaranalysis.learning.WekaXtextClusterGeneratorTest.keywordNormalizeClusteringWith200ClustersTest(WekaXtextClusterGeneratorTest.java:153)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
	at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
	at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
	at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
	at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
	at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:86)
	at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:678)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192)