[equinox-dev] Could not install bundle ... Bundle ... has already been i

[<Warren.Paul@xxxxxxxxx>]

Title: Could not install bundle ... Bundle ... has already been installed from ... errors in log

We're creating our product using the headless product build.  When I launch it I see an error like this in the error log for each plugin:

!ENTRY org.eclipse.update.configurator 4 0 2008-07-16 17:20:33.320
!MESSAGE Could not install bundle plugins/org.eclipse.compare_3.4.0.I20080604.jar   Bundle "org.eclipse.compare" version "3.4.0.I20080604" has already been installed from: reference:file:plugins\org.eclipse.compare_3.4.0.I20080604.jar

It appears to be coming from the org.eclipse.equinox.simpleconfigurator/bundles.info file.  I've had a look at the ConfigurationActivator.installBundles method but it's not clear exactly what's going on.  Ideas?

Thanks,
Warren