Bug 114648 export file system/archive wizard initally has error when no selection seeded
Make sure nothing is selected in your Navigator or Package Explorer. File > Import/Export Select Archive or File System BUG: there is initially an error - There are no resources currently selected for export. There should not initially be an error in these wizards.
bundles/org.eclipse.ui.ide/extensions/org/eclipse/ui/dialogs/WizardExportResourcesPage.java
resourcesToExport.add(resourcesToExportIterator.next());
        return resourcesToExport;
    }
    /**
     * Returns this page's collection of currently-specified resources to be 
     * exported. This is the primary resource selection facility accessor for 
     * subclasses.
     *
     * @return an iterator over the collection of resources currently selected 
     * for export (element type: <code>IResource</code>). This will include
     * white checked folders and individually checked files.
     */
    protected Iterator getSelectedResourcesIterator() {
        return this.resourceGroup.getAllCheckedListItems().iterator();
    }
    /**
     * Returns the resource extensions currently specified to be exported.
     *
     * @return the resource extensions currently specified to be exported (element 
     *   type: <code>String</code>)
     */
    protected List getTypesToExport() {
        return selectedTypes;
    }
    /**
     * Returns this page's collection of currently-specified resources to be 
     * exported. This returns both folders and files - for just the files use
     * getSelectedResources.
     *
     * @return a collection of resources currently selected