Flex "Internal build error"

I started getting "Internal build error" messages whenever I build anything other than a one class Flex library. The log error from C:\work\workspace\.metadata\.log is:

!ENTRY org.eclipse.ui 4 0 2008-03-29 09:13:16.625
!MESSAGE Unhandled event loop exception
!STACK 0
java.lang.NullPointerException
at com.adobe.flexbuilder.exportimport.importwizard.FolderProjectImporter.findFile(FolderProjectImporter.java:107)
at com.adobe.flexbuilder.exportimport.importwizard.FolderProjectImporter.computeDeepPath(FolderProjectImporter.java:95)
at com.adobe.flexbuilder.exportimport.importwizard.FolderProjectImporter.validate(FolderProjectImporter.java:41)
at com.adobe.flexbuilder.exportimport.importwizard.ImportWizardPage.validatePage(ImportWizardPage.java:310)
at com.adobe.flexbuilder.exportimport.importwizard.ImportWizardPage$4.modifyText(ImportWizardPage.java:178)
at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:166)
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.Widget.sendEvent(Widget.java:962)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:943)
at org.eclipse.swt.widgets.Text.wmCommandChild(Text.java:2366)
at org.eclipse.swt.widgets.Control.WM_COMMAND(Control.java:3801)
at org.eclipse.swt.widgets.Control.windowProc(Control.java:3675)
at org.eclipse.swt.widgets.Display.windowProc(Display.java:4351)
at org.eclipse.swt.internal.win32.OS.CallWindowProcW(Native Method)
at org.eclipse.swt.internal.win32.OS.CallWindowProc(OS.java:2179)

I found a recommendation to re-install Flex Builder, so I've done that and got a "Product Extension not established automatically" error. Jeez. More detail:

java.io.FileNotFoundException: C:\Program Files\Adobe\Flex Builder 3 Plug-in\eclipse\features\com.adobe.flexbuilder.feature.core_3.0.194161\feature.xml (The system cannot find the path specified)

Clicked OK to let it finish anyway.

Back to Eclipse and...success! The project builds properly!

First things first

This blog will be about programming in Flex and other far-out technologies. A lot of it will be notes about problems I run into and solutions that I find.