Error occured (DiagnosticWrappedException): org.eclipse.emf.ecore.xmi.FeatureNotFoundException: Feature 'vertices' not found. (file:///C:/Users/chenp/Documents/Eclipse/VIATRA-Generator/Metrics/Metrics-Calculation/SocialNetwork_plugin/inputs/start.xmi, 3, 57)
    org.eclipse.emf.ecore.resource.impl.ResourceSetImpl.handleDemandLoadException(ResourceSetImpl.java:319)
    org.eclipse.emf.ecore.resource.impl.ResourceSetImpl.demandLoadHelper(ResourceSetImpl.java:278)
    org.eclipse.xtext.resource.XtextResourceSet.getResource(XtextResourceSet.java:266)
    org.eclipse.xtext.resource.SynchronizedXtextResourceSet.getResource(SynchronizedXtextResourceSet.java:25)
    hu.bme.mit.inf.dslreasoner.application.execution.ModelLoader.loadModel(ModelLoader.java:41)
    hu.bme.mit.inf.dslreasoner.application.execution.GenerationTaskExecutor.executeGenerationTask(GenerationTaskExecutor.java:171)
    hu.bme.mit.inf.dslreasoner.application.execution.ScriptExecutor._execute(ScriptExecutor.java:141)
    hu.bme.mit.inf.dslreasoner.application.execution.ScriptExecutor.execute(ScriptExecutor.java:382)
    hu.bme.mit.inf.dslreasoner.application.execution.ScriptExecutor.executeScript(ScriptExecutor.java:122)
    hu.bme.mit.inf.dslreasoner.application.execution.StandaloneScriptExecutor.executeScript(StandaloneScriptExecutor.java:155)
    hu.bme.mit.inf.dslreasoner.application.execution.StandaloneScriptExecutor.executeScript(StandaloneScriptExecutor.java:147)
    ca.mcgill.ecse.socialnetwork.runner.Main.runWithPath(Main.java:24)
    ca.mcgill.ecse.socialnetwork.runner.Main.main(Main.java:40)