code: private void trackErrorPages(final BundleContext bundleContext) {
  		final ServiceTracker<ErrorPageMapping, ErrorPageWebElement> errorPagesTracker = ErrorPageMappingTracker
  				.createTracker(extenderContext, bundleContext);
  		errorPagesTracker.open();
  		trackers.add(0, errorPagesTracker);
  	}
docs: Track error pages
  
  @param bundleContext the BundleContext associated with this bundle