eclipse - Flash Builder Export Release Build Fails -

i'm having issue when trying export release build of air application in flash builder 4.5. after choosing key sign package , clicking finish complete export, errors saying "error occurred while saving project settings: "default" build target cannot found selected project." i've included error message output log in .metadata folder. great baffling me.

!entry com.adobe.flexbuilder.project 4 43 2011-05-10 15:56:11.432 !message failed build target settings: default !stack 0 java.lang.exception @ com.adobe.flexbuilder.project.internal.flexprojectcore.createerrorsta tus(flexprojectcore.java:1009) @ com.adobe.flexbuilder.util.logging.globallogimpl.log(globallogimpl.ja va:66) @ com.adobe.flexbuilder.util.logging.globallog.log(globallog.java:52) @ com.adobe.flexbuilder.project.ui.utils.projectbuildpackagingui.doappl ysettings(projectbuildpackagingui.java:754) @ com.adobe.flexbuilder.project.ui.utils.projectbuildpackagingui.applys ettings(projectbuildpackagingui.java:781) @ com.adobe.flexbuilder.exportimport.releaseversion.ui.exportreleasever sionbuildpackagingpagecontent.savesettings(exportreleaseversionbuildpa ckagingpagecontent.java:131) @ com.adobe.flexbuilder.exportimport.releaseversion.ui.exportreleasever sionbuildpackagingpage.savesettings(exportreleaseversionbuildpackaging page.java:84) @ com.adobe.flexbuilder.exportimport.releaseversion.ui.exportreleasever sionwizard.performfinish(exportreleaseversionwizard.java:144) @ org.eclipse.jface.wizard.wizarddialog.finishpressed(wizarddialog.java :811) @ org.eclipse.jface.wizard.wizarddialog.buttonpressed(wizarddialog.java :430) @ org.eclipse.jface.dialogs.dialog$2.widgetselected(dialog.java:624) @ org.eclipse.swt.widgets.typedlistener.handleevent(typedlistener.java: 234) @ org.eclipse.swt.widgets.eventtable.sendevent(eventtable.java:84) @ org.eclipse.swt.widgets.widget.sendevent(widget.java:1053) @ org.eclipse.swt.widgets.display.rundeferredevents(display.java:4066) @ org.eclipse.swt.widgets.display.readanddispatch(display.java:3657) @ org.eclipse.jface.window.window.runeventloop(window.java:825) @ org.eclipse.jface.window.window.open(window.java:801) @ com.adobe.flexbuilder.exportimport.releaseversion.exportreleaseversio naction$1.run(exportreleaseversionaction.java:97) @ com.adobe.flexbuilder.exportimport.releaseversion.exportreleaseversio naction.run(exportreleaseversionaction.java:103) @ org.eclipse.ui.internal.pluginaction.runwithevent(pluginaction.java:2 51) @ org.eclipse.ui.internal.wwinpluginaction.runwithevent(wwinpluginactio n.java:229) @ org.eclipse.jface.action.actioncontributionitem.handlewidgetselection (actioncontributionitem.java:584) @ org.eclipse.jface.action.actioncontributionitem.access$2(actioncontri butionitem.java:501) @ org.eclipse.jface.action.actioncontributionitem$5.handleevent(actionc ontributionitem.java:411) @ org.eclipse.swt.widgets.eventtable.sendevent(eventtable.java:84) @ org.eclipse.swt.widgets.widget.sendevent(widget.java:1053) @ org.eclipse.swt.widgets.display.rundeferredevents(display.java:4066) @ org.eclipse.swt.widgets.display.readanddispatch(display.java:3657) @ org.eclipse.ui.internal.workbench.runeventloop(workbench.java:2640) @ org.eclipse.ui.internal.workbench.runui(workbench.java:2604) @ org.eclipse.ui.internal.workbench.access$4(workbench.java:2438) @ org.eclipse.ui.internal.workbench$7.run(workbench.java:671) @ org.eclipse.core.databinding.observable.realm.runwithdefault(realm.ja va:332) @ org.eclipse.ui.internal.workbench.createandrunworkbench(workbench.jav a:664) @ org.eclipse.ui.platformui.createandrunworkbench(platformui.java:149) @ com.adobe.flexbuilder.standalone.flashbuilderapplication.start(flashb uilderapplication.java:108) @ org.eclipse.equinox.internal.app.eclipseapphandle.run(eclipseapphandl e.java:196) @ org.eclipse.core.runtime.internal.adaptor.eclipseapplauncher.runappli cation(eclipseapplauncher.java:110) @ org.eclipse.core.runtime.internal.adaptor.eclipseapplauncher.start(ec lipseapplauncher.java:79) @ org.eclipse.core.runtime.adaptor.eclipsestarter.run(eclipsestarter.ja va:369) @ org.eclipse.core.runtime.adaptor.eclipsestarter.run(eclipsestarter.ja va:179) @ sun.reflect.nativemethodaccessorimpl.invoke0(native method) @ sun.reflect.nativemethodaccessorimpl.invoke(unknown source) @ sun.reflect.delegatingmethodaccessorimpl.invoke(unknown source) @ java.lang.reflect.method.invoke(unknown source) @ org.eclipse.equinox.launcher.main.invokeframework(main.java:619) @ org.eclipse.equinox.launcher.main.basicrun(main.java:574) @ org.eclipse.equinox.launcher.main.run(main.java:1407) 

update:

i have tried j_a_x has recommended. unfortunately none of work. seems problem somewhere within project settings. have tried running export release build project on different machines fresh installs of flash builder, same error message produced every time. we've looked through many settings may come down having create new project , copy code new application.

although quite old post have run same problem using flash builder 4.6. new air/flex/flash etc apologies in advance terminology errors! still whilst trying export new project did come across same error you, , after lot of searching on google , starting lose live, tried bing , found link http://forums.adobe.com/thread/850398?start=0&tstart=0

when flash builder project closed edit .actionscriptproperties file in notepad , have buildtargets section - in file <buildtargets/>. replaced snippet sandeep had posted in forum

<buildtargets>     <buildtarget buildtargetname="default">       <airsettings aircertificatepath="" airtimestamp="true" anepathset="false" version="1">         <airexcludes/>         <anepaths/>       </airsettings>       <actionscriptsettings version="1"/>     </buildtarget>   </buildtargets> 

to delight possible export application release build.

by sounds of things other forums, settings file in state in first place may due older versions of fb or in case i'm pretty sure because used airlaunchpad create project - did seem idea @ time. anyway hope may in same predicament!