android - Error generating Gradle in Eclipse ADT -

i have android project built in eclipse, , wish migrate android studio. though android studio works fine without gradle build files, want create them using eclipse adt explained here.

however, when trying generate gradle files, eclipse shows me error log click on "finish". have tried decode means no avail.

here error in question:

java.lang.reflect.invocationtargetexception @ org.eclipse.jface.operation.modalcontext.runincurrentthread(modalcontext.java:477) @ org.eclipse.jface.operation.modalcontext.run(modalcontext.java:372) @ org.eclipse.jface.wizard.wizarddialog.run(wizarddialog.java:1028) @ com.android.ide.eclipse.adt.internal.wizards.exportgradle.gradleexportpage.generatebuildfiles(gradleexportpage.java:293) @ com.android.ide.eclipse.adt.internal.wizards.exportgradle.gradleexportwizard.performfinish(gradleexportwizard.java:32) @ org.eclipse.jface.wizard.wizarddialog.finishpressed(wizarddialog.java:827) @ org.eclipse.jface.wizard.wizarddialog.buttonpressed(wizarddialog.java:432) @ org.eclipse.jface.dialogs.dialog$2.widgetselected(dialog.java:624) @ org.eclipse.swt.widgets.typedlistener.handleevent(typedlistener.java:248) @ org.eclipse.swt.widgets.eventtable.sendevent(eventtable.java:84) @ org.eclipse.swt.widgets.widget.sendevent(widget.java:1053) @ org.eclipse.swt.widgets.display.rundeferredevents(display.java:4169) @ org.eclipse.swt.widgets.display.readanddispatch(display.java:3758) @ org.eclipse.jface.window.window.runeventloop(window.java:825) @ org.eclipse.jface.window.window.open(window.java:801) @ org.eclipse.ui.internal.handlers.wizardhandler$export.executehandler(wizardhandler.java:103) @ org.eclipse.ui.internal.handlers.wizardhandler.execute(wizardhandler.java:279) @ org.eclipse.ui.internal.handlers.handlerproxy.execute(handlerproxy.java:290) @ org.eclipse.ui.internal.handlers.e4handlerproxy.execute(e4handlerproxy.java:76) @ 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.e4.core.internal.di.methodrequestor.execute(methodrequestor.java:56) @ org.eclipse.e4.core.internal.di.injectorimpl.invokeusingclass(injectorimpl.java:231) @ org.eclipse.e4.core.internal.di.injectorimpl.invoke(injectorimpl.java:212) @ org.eclipse.e4.core.contexts.contextinjectionfactory.invoke(contextinjectionfactory.java:131) @ org.eclipse.e4.core.commands.internal.handlerserviceimpl.executehandler(handlerserviceimpl.java:171) @ org.eclipse.ui.internal.handlers.legacyhandlerservice.executecommand(legacyhandlerservice.java:515) @ org.eclipse.ui.internal.actions.commandaction.runwithevent(commandaction.java:157) @ org.eclipse.jface.action.actioncontributionitem.handlewidgetselection(actioncontributionitem.java:584) @ org.eclipse.jface.action.actioncontributionitem.access$2(actioncontributionitem.java:501) @ org.eclipse.jface.action.actioncontributionitem$5.handleevent(actioncontributionitem.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:4169) @ org.eclipse.swt.widgets.display.readanddispatch(display.java:3758) @ org.eclipse.e4.ui.internal.workbench.swt.partrenderingengine$9.run(partrenderingengine.java:1053) @ org.eclipse.core.databinding.observable.realm.runwithdefault(realm.java:332) @ org.eclipse.e4.ui.internal.workbench.swt.partrenderingengine.run(partrenderingengine.java:942) @ org.eclipse.e4.ui.internal.workbench.e4workbench.createandrunui(e4workbench.java:86) @ org.eclipse.ui.internal.workbench$5.run(workbench.java:588) @ org.eclipse.core.databinding.observable.realm.runwithdefault(realm.java:332) @ org.eclipse.ui.internal.workbench.createandrunworkbench(workbench.java:543) @ org.eclipse.ui.platformui.createandrunworkbench(platformui.java:149) @ org.eclipse.ui.internal.ide.application.ideapplication.start(ideapplication.java:124) @ org.eclipse.equinox.internal.app.eclipseapphandle.run(eclipseapphandle.java:196) @ org.eclipse.core.runtime.internal.adaptor.eclipseapplauncher.runapplication(eclipseapplauncher.java:110) @ org.eclipse.core.runtime.internal.adaptor.eclipseapplauncher.start(eclipseapplauncher.java:79) @ org.eclipse.core.runtime.adaptor.eclipsestarter.run(eclipsestarter.java:353) @ org.eclipse.core.runtime.adaptor.eclipsestarter.run(eclipsestarter.java:180) @ 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:629) @ org.eclipse.equinox.launcher.main.basicrun(main.java:584) @ org.eclipse.equinox.launcher.main.run(main.java:1438) @ org.eclipse.equinox.launcher.main.main(main.java:1414)  caused by: java.lang.nullpointerexception         @ com.android.ide.eclipse.adt.internal.wizards.exportgradle.buildfilecreator.appenddependencies(buildfilecreator.java:368)         @ com.android.ide.eclipse.adt.internal.wizards.exportgradle.buildfilecreator.createbuildfiles(buildfilecreator.java:217)         @ com.android.ide.eclipse.adt.internal.wizards.exportgradle.gradleexportpage$6.run(gradleexportpage.java:274)         @ org.eclipse.jface.operation.modalcontext.runincurrentthread(modalcontext.java:464)         ... 58 more 

anyone have idea means? code compiles fine , runs both in eclipse , in android studio (without gradle), why i'm dumbfounded, surely there isn't wrong in source code cause error

i had same error. able around manually creating empty "settings.gradle" file in root of project trying export. had create other dependent projects (i.e. modules show on "exported modules" area of export screen).

hope helps.