I been working on this Servlet project all morning and now suddenly I cannot get eclipse to export the project to a war file. I tried restarting eclipse and cleaning the project but I just get the same result. Any ideas?

org.eclipse.core.runtime.CoreException: Extended Operation failure: 
org.eclipse.jst.j2ee.internal.web.archive.operations.WebComponentExportOperation
    at org.eclipse.wst.common.frameworks.internal.datamodel.ui.DataModelWizard.performFinish(DataModelWizard.java:182)
    at org.eclipse.jface.wizard.WizardDialog.finishPressed(WizardDialog.java:742)
    at org.eclipse.jface.wizard.WizardDialog.buttonPressed(WizardDialog.java:373)
    at org.eclipse.jface.dialogs.Dialog$2.widgetSelected(Dialog.java:618)
    at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:227)
    at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:66)
    at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:938)
    at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3682)
    at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3293)
    at org.eclipse.jface.window.Window.runEventLoop(Window.java:820)
    at org.eclipse.jface.window.Window.open(Window.java:796)
    at org.eclipse.ui.actions.ExportResourcesAction.run(ExportResourcesAction.java:180)
    at org.eclipse.ui.actions.BaseSelectionListenerAction.runWithEvent(BaseSelectionListenerAction.java:168)
    at org.eclipse.jface.action.ActionContributionItem.handleWidgetSelection(ActionContributionItem.java:546)
    at org.eclipse.jface.action.ActionContributionItem.access$2(ActionContributionItem.java:490)
    at org.eclipse.jface.action.ActionContributionItem$5.handleEvent(ActionContributionItem.java:402)
    at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:66)
    at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:938)
    at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3682)
    at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3293)
    at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2389)
    at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2353)
    at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2219)
    at org.eclipse.ui.internal.Workbench$4.run(Workbench.java:466)
    at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:289)
    at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:461)
    at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
    at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:106)
    at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:169)
    at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:106)
    at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:76)
    at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:363)
    at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:176)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:508)
    at org.eclipse.equinox.launcher.Main.basicRun(Main.java:447)
    at org.eclipse.equinox.launcher.Main.run(Main.java:1173)
org.eclipse.core.runtime.CoreException[0]: org.eclipse.core.commands.ExecutionException: Error exportingWar File
    at org.eclipse.jst.j2ee.internal.archive.operations.J2EEArtifactExportOperation.execute(J2EEArtifactExportOperation.java:103)
    at org.eclipse.wst.common.frameworks.internal.datamodel.DataModelPausibleOperationImpl$1.run(DataModelPausibleOperationImpl.java:376)
    at org.eclipse.core.internal.resources.Workspace.run(Workspace.java:1797)
    at org.eclipse.wst.common.frameworks.internal.datamodel.DataModelPausibleOperationImpl.runOperation(DataModelPausibleOperationImpl.java:401)
    at org.eclipse.wst.common.frameworks.internal.datamodel.DataModelPausibleOperationImpl.runOperation(DataModelPausibleOperationImpl.java:352)
    at org.eclipse.wst.common.frameworks.internal.datamodel.DataModelPausibleOperationImpl.doExecute(DataModelPausibleOperationImpl.java:242)
    at org.eclipse.wst.common.frameworks.internal.datamodel.DataModelPausibleOperationImpl.executeImpl(DataModelPausibleOperationImpl.java:214)
    at org.eclipse.wst.common.frameworks.internal.datamodel.DataModelPausibleOperationImpl.cacheThreadAndContinue(DataModelPausibleOperationImpl.java:89)
    at org.eclipse.wst.common.frameworks.internal.datamodel.DataModelPausibleOperationImpl.execute(DataModelPausibleOperationImpl.java:202)
    at org.eclipse.wst.common.frameworks.internal.datamodel.ui.DataModelWizard$1$CatchThrowableRunnableWithProgress.run(DataModelWizard.java:211)
    at org.eclipse.jface.operation.ModalContext$ModalContextThread.run(ModalContext.java:113)
Caused by: org.eclipse.jst.j2ee.commonarchivecore.internal.exception.SaveFailureException: IWAE0017E Unable to replace original archive: C:\Users\mark\uploads\myfirstjsp.war
    at org.eclipse.jst.j2ee.commonarchivecore.internal.impl.ArchiveImpl.cleanupAfterTempSave(ArchiveImpl.java:322)
    at org.eclipse.jst.j2ee.commonarchivecore.internal.impl.ArchiveImpl.saveAsNoReopen(ArchiveImpl.java:1182)
    at org.eclipse.jst.j2ee.internal.web.archive.operations.WebComponentExportOperation.export(WebComponentExportOperation.java:54)
    at org.eclipse.jst.j2ee.internal.archive.operations.J2EEArtifactExportOperation.execute(J2EEArtifactExportOperation.java:95)
    ... 10 more