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java.lang.NullPointerException: 	at edu.illinois.codingspectator.codingtracker.operations.OperationLexer.hasNextOperation(OperationLexer.java:32)	at edu.illinois.codingspectator.codingtracker.operations.OperationDeserializer.getUserOperations(OperationDeserializer.java:52)	at edu.illinois.codingspectator.codingtracker.replaying.UserOperationReplayer$2.run(UserOperationReplayer.java:126)	at org.eclipse.jface.action.Action.runWithEvent(Action.java:498)	at org.eclipse.jface.action.ActionContributionItem.handleWidgetSelection(ActionContributionItem.java:584)	at org.eclipse.jface.action.ActionContributionItem.access$2(ActionContributionItem.java:501)	at org.eclipse.jface.action.ActionContributionItem$6.handleEvent(ActionContributionItem.java:452)	at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1258)	at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3540)	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3161)	at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2640)	at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2604)	at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2438)	at org.eclipse.ui.internal.Workbench$7.run(Workbench.java:671)	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)	at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:664)	at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)	at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:115)	at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110)	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79)	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:369)	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:597)	at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:619)	at org.eclipse.equinox.launcher.Main.basicRun(Main.java:574)	at org.eclipse.equinox.launcher.Main.run(Main.java:1407)