[gmf-dev] Errors when generating diagram editor using GMF in Eclipse

[Nipuni Perera <nipunirp6@xxxxxxxxx>]

I get the following error during the last phase of GMF (i.e.: generating diagram editor) 

java.lang.NoClassDefFoundError: org/eclipse/m2m/internal/qvt/oml/runtime/project/BundleUnitResolver
at org.eclipse.gmf.internal.xpand.util.BundleResourceManager.getQVTUnitResolver(BundleResourceManager.java:118)
at org.eclipse.gmf.internal.xpand.util.ResourceManagerImpl.getQvtCompiler(ResourceManagerImpl.java:97)
at org.eclipse.gmf.internal.xpand.util.ResourceManagerImpl.doLoadQvtResource(ResourceManagerImpl.java:75)
at org.eclipse.gmf.internal.xpand.util.ResourceManagerImpl.loadQvtResourceThroughCache(ResourceManagerImpl.java:63)
at org.eclipse.gmf.internal.xpand.util.ResourceManagerImpl.loadQvtResource(ResourceManagerImpl.java:46)
at org.eclipse.gmf.internal.xpand.model.Scope.findExtension(Scope.java:148)
at org.eclipse.gmf.internal.xpand.model.ExecutionContextImpl.getImportedModules(ExecutionContextImpl.java:293)
at org.eclipse.gmf.internal.xpand.model.ExecutionContextImpl.getOCLEnvironment(ExecutionContextImpl.java:254)
at org.eclipse.gmf.internal.xpand.ocl.TypeHelper.getTypeForName(TypeHelper.java:35)
at org.eclipse.gmf.internal.xpand.model.ExecutionContextImpl.findDefinition(ExecutionContextImpl.java:231)
at org.eclipse.gmf.internal.xpand.model.ExecutionContextImpl.findDefinition(ExecutionContextImpl.java:167)
at org.eclipse.gmf.internal.xpand.XpandFacade.evaluate(XpandFacade.java:54)
at org.eclipse.gmf.internal.common.codegen.XpandTextEmitter.generate(XpandTextEmitter.java:64)
at org.eclipse.gmf.internal.common.codegen.GeneratorBase.doGenerateJavaClass(GeneratorBase.java:347)
at org.eclipse.gmf.codegen.util.Generator.generateExternalizationSupport(Generator.java:892)
at org.eclipse.gmf.codegen.util.Generator.customRun(Generator.java:135)
at org.eclipse.gmf.internal.common.codegen.GeneratorBase$1.run(GeneratorBase.java:486)
at org.eclipse.core.internal.resources.Workspace.run(Workspace.java:2240)
at org.eclipse.core.internal.resources.Workspace.run(Workspace.java:2262)
at org.eclipse.gmf.internal.common.codegen.GeneratorBase.doRun(GeneratorBase.java:483)
at org.eclipse.gmf.internal.common.codegen.GeneratorBase.run(GeneratorBase.java:90)
at org.eclipse.gmf.internal.codegen.popup.actions.ExecuteTemplatesOperation.run(ExecuteTemplatesOperation.java:226)
at org.eclipse.gmf.internal.codegen.popup.actions.ExecuteTemplatesOperation$1.run(ExecuteTemplatesOperation.java:122)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:56)

Can someone suggest a solution? 
Thanks