Unable to export project as WAR file in Eclipse -

i received error during export of war file project. can here? thanks!

org.eclipse.core.commands.executionexception: error exportingc:/users/xxxxx.war @  org.eclipse.jst.j2ee.internal.archive.operations.componentexportoperation.execute(componentexportoperation.java:150) @ org.eclipse.wst.common.frameworks.internal.datamodel.datamodelpausibleoperationimpl$1.run(datamodelpausibleoperationimpl.java:385) @ org.eclipse.core.internal.resources.workspace.run(workspace.java:2344) @ org.eclipse.wst.common.frameworks.internal.datamodel.datamodelpausibleoperationimpl.runoperation(datamodelpausibleoperationimpl.java:410) @ org.eclipse.wst.common.frameworks.internal.datamodel.datamodelpausibleoperationimpl.runoperation(datamodelpausibleoperationimpl.java:360) @ org.eclipse.wst.common.frameworks.internal.datamodel.datamodelpausibleoperationimpl.doexecute(datamodelpausibleoperationimpl.java:247) @ org.eclipse.wst.common.frameworks.internal.datamodel.datamodelpausibleoperationimpl.executeimpl(datamodelpausibleoperationimpl.java:219) @ org.eclipse.wst.common.frameworks.internal.datamodel.datamodelpausibleoperationimpl.cachethreadandcontinue(datamodelpausibleoperationimpl.java:89) @ org.eclipse.wst.common.frameworks.internal.datamodel.datamodelpausibleoperationimpl.execute(datamodelpausibleoperationimpl.java:207) @ org.eclipse.wst.common.frameworks.internal.datamodel.ui.datamodelwizard$1catchthrowablerunnablewithprogress.run(datamodelwizard.java:220) @ org.eclipse.jface.operation.modalcontext$modalcontextthread.run(modalcontext.java:121) 

right click on web project folder , select export pop-up menu. select war file in export window , select next. specify web project want export (this field primed if used pop-up menu open wizard), , specify location new war file optional: optionally, supply war export options, such whether or not include java™ source files in war, , whether overwrite existing resources during export process. source files not included in war file, because not necessary server run web application. click finish.