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java.lang.NullPointerException: 	at io.sarl.lang.actionprototype.DefaultActionPrototypeProvider.buildParameter(DefaultActionPrototypeProvider.java:91)	at io.sarl.lang.actionprototype.DefaultActionPrototypeProvider.buildSignaturesForArgDefaultValues(DefaultActionPrototypeProvider.java:163)	at io.sarl.lang.actionprototype.DefaultActionPrototypeProvider.createPrototype(DefaultActionPrototypeProvider.java:228)	at io.sarl.lang.actionprototype.DefaultActionPrototypeProvider.createPrototypeFromSarlModel(DefaultActionPrototypeProvider.java:257)	at io.sarl.lang.jvmmodel.SARLJvmModelInferrer.transform(SARLJvmModelInferrer.java:1247)	at org.eclipse.xtend.core.jvmmodel.XtendJvmModelInferrer.transform(XtendJvmModelInferrer.java:565)	at io.sarl.lang.jvmmodel.SARLJvmModelInferrer.transform(SARLJvmModelInferrer.java:1064)	at io.sarl.lang.jvmmodel.SARLJvmModelInferrer.appendAOPMembers(SARLJvmModelInferrer.java:1876)	at io.sarl.lang.jvmmodel.SARLJvmModelInferrer.initialize(SARLJvmModelInferrer.java:670)	at io.sarl.lang.jvmmodel.SARLJvmModelInferrer$2.run(SARLJvmModelInferrer.java:400)	at org.eclipse.xtend.core.jvmmodel.XtendJvmModelInferrer$3.run(XtendJvmModelInferrer.java:217)	at org.eclipse.xtext.xbase.resource.BatchLinkableResource.ensureJvmMembersInitialized(BatchLinkableResource.java:231)	at org.eclipse.xtext.xbase.jvmmodel.JvmModelAssociator.getOrInstall(JvmModelAssociator.java:112)	at org.eclipse.xtext.xbase.jvmmodel.JvmModelAssociator.getLogicalContainerMapping(JvmModelAssociator.java:127)	at org.eclipse.xtext.xbase.jvmmodel.JvmModelAssociator.getAssociatedExpression(JvmModelAssociator.java:134)	at org.eclipse.xtext.xbase.typesystem.internal.LogicalContainerAwareReentrantTypeResolver.recordExpressions(LogicalContainerAwareReentrantTypeResolver.java:414)	at org.eclipse.xtext.xbase.typesystem.internal.LogicalContainerAwareReentrantTypeResolver.prepare(LogicalContainerAwareReentrantTypeResolver.java:408)	at org.eclipse.xtext.xbase.typesystem.internal.LogicalContainerAwareReentrantTypeResolver.computeTypes(LogicalContainerAwareReentrantTypeResolver.java:696)	at org.eclipse.xtend.core.typesystem.XtendReentrantTypeResolver.computeTypes(XtendReentrantTypeResolver.java:382)	at org.eclipse.xtext.xbase.typesystem.internal.DefaultReentrantTypeResolver.resolve(DefaultReentrantTypeResolver.java:163)	at org.eclipse.xtext.xbase.typesystem.internal.DefaultReentrantTypeResolver.reentrantResolve(DefaultReentrantTypeResolver.java:139)	at org.eclipse.xtext.xbase.typesystem.internal.CompoundReentrantTypeResolver.reentrantResolve(CompoundReentrantTypeResolver.java:79)	at org.eclipse.xtext.xbase.typesystem.internal.CachingBatchTypeResolver$LazyResolvedTypes.resolveTypes(CachingBatchTypeResolver.java:80)	at org.eclipse.xtext.xbase.typesystem.internal.CachingBatchTypeResolver$2.process(CachingBatchTypeResolver.java:57)	at org.eclipse.xtext.xbase.typesystem.internal.CachingBatchTypeResolver$2.process(CachingBatchTypeResolver.java:1)	at org.eclipse.xtext.util.concurrent.IUnitOfWork$Void.exec(IUnitOfWork.java:37)	at org.eclipse.xtext.util.OnChangeEvictingCache.execWithoutCacheClear(OnChangeEvictingCache.java:129)	at org.eclipse.xtext.xbase.typesystem.internal.CachingBatchTypeResolver.doResolveTypes(CachingBatchTypeResolver.java:53)	at org.eclipse.xtext.xbase.typesystem.internal.AbstractBatchTypeResolver.resolveTypes(AbstractBatchTypeResolver.java:69)	at org.eclipse.xtext.xbase.resource.BatchLinkingService.resolveBatched(BatchLinkingService.java:71)	at org.eclipse.xtext.xbase.resource.BatchLinkableResource.resolveLazyCrossReferences(BatchLinkableResource.java:165)	at org.eclipse.xtext.EcoreUtil2.resolveLazyCrossReferences(EcoreUtil2.java:498)	at org.eclipse.xtext.ui.editor.reconciler.XtextDocumentReconcileStrategy.postParse(XtextDocumentReconcileStrategy.java:175)	at org.eclipse.xtext.ui.editor.reconciler.XtextDocumentReconcileStrategy.doReconcile(XtextDocumentReconcileStrategy.java:153)	at org.eclipse.xtext.ui.editor.reconciler.XtextDocumentReconcileStrategy.reconcile(XtextDocumentReconcileStrategy.java:67)	at org.eclipse.xtext.ui.editor.reconciler.XtextReconciler.doRun(XtextReconciler.java:442)	at org.eclipse.xtext.ui.editor.reconciler.XtextReconciler.access$3(XtextReconciler.java:422)	at org.eclipse.xtext.ui.editor.reconciler.XtextReconciler$1.process(XtextReconciler.java:363)	at org.eclipse.xtext.ui.editor.reconciler.XtextReconciler$1.process(XtextReconciler.java:1)	at org.eclipse.xtext.util.concurrent.IUnitOfWork$Void.exec(IUnitOfWork.java:37)	at org.eclipse.xtext.resource.OutdatedStateManager.exec(OutdatedStateManager.java:98)	at org.eclipse.xtext.ui.editor.model.XtextDocument$XtextDocumentLocker.modify(XtextDocument.java:428)	at org.eclipse.xtext.ui.editor.model.XtextDocument.internalModify(XtextDocument.java:162)	at org.eclipse.xtext.ui.editor.reconciler.XtextReconciler.run(XtextReconciler.java:360)	at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55)