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java.lang.IllegalArgumentException: The 'no null' constraint is violated	at org.eclipse.emf.common.util.AbstractEList.validate(AbstractEList.java:97)	at org.eclipse.emf.common.util.BasicEList.addUnique(BasicEList.java:418)	at org.eclipse.emf.common.notify.impl.NotifyingListImpl.doAddUnique(NotifyingListImpl.java:325)	at org.eclipse.emf.common.notify.impl.NotifyingListImpl.addUnique(NotifyingListImpl.java:309)	at org.eclipse.emf.common.util.AbstractEList.add(AbstractEList.java:303)	at org.eclipse.xtext.java.resource.JavaDerivedStateComputer$3.acceptResult(JavaDerivedStateComputer.java:236)	at org.eclipse.jdt.internal.compiler.Compiler.compile(Compiler.java:480)	at org.eclipse.xtext.java.resource.JavaDerivedStateComputer.installFull(JavaDerivedStateComputer.java:244)	at org.eclipse.xtext.java.resource.JavaResource$4.apply(JavaResource.java:140)	at org.eclipse.xtext.java.resource.JavaResource.initializing(JavaResource.java:150)	at org.eclipse.xtext.java.resource.JavaResource.installFull(JavaResource.java:144)	at org.eclipse.xtext.java.resource.JavaResource.getContents(JavaResource.java:113)	at org.eclipse.xtext.build.IncrementalBuilder$InternalStatefulIncrementalBuilder$5.apply(IncrementalBuilder.java:242)	at org.eclipse.xtext.build.IncrementalBuilder$InternalStatefulIncrementalBuilder$5.apply(IncrementalBuilder.java:1)	at org.eclipse.xtext.build.ClusteringStorageAwareResourceLoader$2.apply(ClusteringStorageAwareResourceLoader.java:91)	at org.eclipse.xtext.build.ClusteringStorageAwareResourceLoader$2.apply(ClusteringStorageAwareResourceLoader.java:1)	at org.eclipse.xtext.xbase.lib.internal.FunctionDelegate.apply(FunctionDelegate.java:42)	at com.google.common.collect.Lists$TransformingRandomAccessList$1.transform(Lists.java:640)	at com.google.common.collect.TransformedIterator.next(TransformedIterator.java:48)	at java.util.AbstractCollection.toArray(AbstractCollection.java:141)	at java.util.ArrayList.addAll(ArrayList.java:577)	at com.google.common.collect.Iterables.addAll(Iterables.java:350)	at org.eclipse.xtext.build.ClusteringStorageAwareResourceLoader.executeClustered(ClusteringStorageAwareResourceLoader.java:95)	at org.eclipse.xtext.build.BuildContext.executeClustered(BuildContext.java:62)	at org.eclipse.xtext.build.IncrementalBuilder$InternalStatefulIncrementalBuilder.launch(IncrementalBuilder.java:268)	at org.eclipse.xtext.build.IncrementalBuilder.build(IncrementalBuilder.java:468)	at org.eclipse.xtext.build.IncrementalBuilder.build(IncrementalBuilder.java:449)	at org.xtext.gradle.builder.XtextGradleBuilder.doBuild(XtextGradleBuilder.java:344)	at org.xtext.gradle.builder.XtextGradleBuilder.access$400(XtextGradleBuilder.java:70)	at org.xtext.gradle.builder.XtextGradleBuilder$3.apply(XtextGradleBuilder.java:289)	at org.xtext.gradle.builder.XtextGradleBuilder$3.apply(XtextGradleBuilder.java:252)	at org.eclipse.xtext.xbase.lib.IteratorExtensions.forEach(IteratorExtensions.java:363)	at org.eclipse.xtext.xbase.lib.IterableExtensions.forEach(IterableExtensions.java:333)	at org.xtext.gradle.builder.XtextGradleBuilder.indexChangedClasspathEntries(XtextGradleBuilder.java:295)	at org.xtext.gradle.builder.XtextGradleBuilder.build(XtextGradleBuilder.java:138)	at org.xtext.gradle.tasks.XtextGenerate.build(XtextGenerate.java:367)	at org.xtext.gradle.tasks.XtextGenerate.generate(XtextGenerate.java:224)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:497)	at org.gradle.internal.reflect.JavaMethod.invoke(JavaMethod.java:75)	at org.gradle.api.internal.project.taskfactory.AnnotationProcessingTaskFactory$IncrementalTaskAction.doExecute(AnnotationProcessingTaskFactory.java:245)	at org.gradle.api.internal.project.taskfactory.AnnotationProcessingTaskFactory$StandardTaskAction.execute(AnnotationProcessingTaskFactory.java:221)	at org.gradle.api.internal.project.taskfactory.AnnotationProcessingTaskFactory$IncrementalTaskAction.execute(AnnotationProcessingTaskFactory.java:232)	at org.gradle.api.internal.project.taskfactory.AnnotationProcessingTaskFactory$StandardTaskAction.execute(AnnotationProcessingTaskFactory.java:210)	at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeAction(ExecuteActionsTaskExecuter.java:80)	at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeActions(ExecuteActionsTaskExecuter.java:61)	at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.execute(ExecuteActionsTaskExecuter.java:46)	at org.gradle.api.internal.tasks.execution.PostExecutionAnalysisTaskExecuter.execute(PostExecutionAnalysisTaskExecuter.java:35)	at org.gradle.api.internal.tasks.execution.SkipUpToDateTaskExecuter.execute(SkipUpToDateTaskExecuter.java:66)	at org.gradle.api.internal.tasks.execution.ValidatingTaskExecuter.execute(ValidatingTaskExecuter.java:58)	at org.gradle.api.internal.tasks.execution.SkipEmptySourceFilesTaskExecuter.execute(SkipEmptySourceFilesTaskExecuter.java:52)	at org.gradle.api.internal.tasks.execution.SkipTaskWithNoActionsExecuter.execute(SkipTaskWithNoActionsExecuter.java:52)	at org.gradle.api.internal.tasks.execution.SkipOnlyIfTaskExecuter.execute(SkipOnlyIfTaskExecuter.java:53)	at org.gradle.api.internal.tasks.execution.ExecuteAtMostOnceTaskExecuter.execute(ExecuteAtMostOnceTaskExecuter.java:43)	at org.gradle.execution.taskgraph.DefaultTaskGraphExecuter$EventFiringTaskWorker.execute(DefaultTaskGraphExecuter.java:203)	at org.gradle.execution.taskgraph.DefaultTaskGraphExecuter$EventFiringTaskWorker.execute(DefaultTaskGraphExecuter.java:185)	at org.gradle.execution.taskgraph.AbstractTaskPlanExecutor$TaskExecutorWorker.processTask(AbstractTaskPlanExecutor.java:66)	at org.gradle.execution.taskgraph.AbstractTaskPlanExecutor$TaskExecutorWorker.run(AbstractTaskPlanExecutor.java:50)	at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor.process(DefaultTaskPlanExecutor.java:25)	at org.gradle.execution.taskgraph.DefaultTaskGraphExecuter.execute(DefaultTaskGraphExecuter.java:110)	at org.gradle.execution.SelectedTaskExecutionAction.execute(SelectedTaskExecutionAction.java:37)	at org.gradle.execution.DefaultBuildExecuter.execute(DefaultBuildExecuter.java:37)	at org.gradle.execution.DefaultBuildExecuter.access$000(DefaultBuildExecuter.java:23)	at org.gradle.execution.DefaultBuildExecuter$1.proceed(DefaultBuildExecuter.java:43)	at org.gradle.execution.DryRunBuildExecutionAction.execute(DryRunBuildExecutionAction.java:32)	at org.gradle.execution.DefaultBuildExecuter.execute(DefaultBuildExecuter.java:37)	at org.gradle.execution.DefaultBuildExecuter.execute(DefaultBuildExecuter.java:30)	at org.gradle.initialization.DefaultGradleLauncher$4.run(DefaultGradleLauncher.java:153)	at org.gradle.internal.Factories$1.create(Factories.java:22)	at org.gradle.internal.progress.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:91)	at org.gradle.internal.progress.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:53)	at org.gradle.initialization.DefaultGradleLauncher.doBuildStages(DefaultGradleLauncher.java:150)	at org.gradle.initialization.DefaultGradleLauncher.access$200(DefaultGradleLauncher.java:32)	at org.gradle.initialization.DefaultGradleLauncher$1.create(DefaultGradleLauncher.java:98)	at org.gradle.initialization.DefaultGradleLauncher$1.create(DefaultGradleLauncher.java:92)	at org.gradle.internal.progress.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:91)	at org.gradle.internal.progress.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:63)	at org.gradle.initialization.DefaultGradleLauncher.doBuild(DefaultGradleLauncher.java:92)	at org.gradle.initialization.DefaultGradleLauncher.run(DefaultGradleLauncher.java:83)	at org.gradle.launcher.exec.InProcessBuildActionExecuter$DefaultBuildController.run(InProcessBuildActionExecuter.java:99)	at org.gradle.tooling.internal.provider.ExecuteBuildActionRunner.run(ExecuteBuildActionRunner.java:28)	at org.gradle.launcher.exec.ChainingBuildActionRunner.run(ChainingBuildActionRunner.java:35)	at org.gradle.launcher.exec.InProcessBuildActionExecuter.execute(InProcessBuildActionExecuter.java:48)	at org.gradle.launcher.exec.InProcessBuildActionExecuter.execute(InProcessBuildActionExecuter.java:30)	at org.gradle.launcher.exec.ContinuousBuildActionExecuter.execute(ContinuousBuildActionExecuter.java:81)	at org.gradle.launcher.exec.ContinuousBuildActionExecuter.execute(ContinuousBuildActionExecuter.java:46)	at org.gradle.launcher.daemon.server.exec.ExecuteBuild.doBuild(ExecuteBuild.java:52)	at org.gradle.launcher.daemon.server.exec.BuildCommandOnly.execute(BuildCommandOnly.java:36)	at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:120)	at org.gradle.launcher.daemon.server.exec.WatchForDisconnection.execute(WatchForDisconnection.java:37)	at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:120)	at org.gradle.launcher.daemon.server.exec.ResetDeprecationLogger.execute(ResetDeprecationLogger.java:26)	at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:120)	at org.gradle.launcher.daemon.server.exec.RequestStopIfSingleUsedDaemon.execute(RequestStopIfSingleUsedDaemon.java:34)	at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:120)	at org.gradle.launcher.daemon.server.exec.ForwardClientInput$2.call(ForwardClientInput.java:74)	at org.gradle.launcher.daemon.server.exec.ForwardClientInput$2.call(ForwardClientInput.java:72)	at org.gradle.util.Swapper.swap(Swapper.java:38)	at org.gradle.launcher.daemon.server.exec.ForwardClientInput.execute(ForwardClientInput.java:72)	at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:120)	at org.gradle.launcher.daemon.server.health.DaemonHealthTracker.execute(DaemonHealthTracker.java:47)	at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:120)	at org.gradle.launcher.daemon.server.exec.LogToClient.doBuild(LogToClient.java:60)	at org.gradle.launcher.daemon.server.exec.BuildCommandOnly.execute(BuildCommandOnly.java:36)	at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:120)	at org.gradle.launcher.daemon.server.exec.EstablishBuildEnvironment.doBuild(EstablishBuildEnvironment.java:72)	at org.gradle.launcher.daemon.server.exec.BuildCommandOnly.execute(BuildCommandOnly.java:36)	at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:120)	at org.gradle.launcher.daemon.server.health.HintGCAfterBuild.execute(HintGCAfterBuild.java:41)	at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:120)	at org.gradle.launcher.daemon.server.exec.StartBuildOrRespondWithBusy$1.run(StartBuildOrRespondWithBusy.java:50)	at org.gradle.launcher.daemon.server.DaemonStateCoordinator$1.run(DaemonStateCoordinator.java:237)	at org.gradle.internal.concurrent.ExecutorPolicy$CatchAndRecordFailures.onExecute(ExecutorPolicy.java:54)	at org.gradle.internal.concurrent.StoppableExecutorImpl$1.run(StoppableExecutorImpl.java:40)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)	at java.lang.Thread.run(Thread.java:745)