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/WizardResourceImportPage.java
protected boolean sourceConflictsWithDestination(IPath sourcePath) {
        return false;
    }
    /*
     * @see WizardDataTransferPage.determinePageCompletion.
     */
    protected boolean determinePageCompletion() {
         
        if (noOpenProjects()) {
            setErrorMessage(IDEWorkbenchMessages.WizardImportPage_noOpenProjects);
            return false;
        }
        return super.determinePageCompletion();
    }
    /**
     * Returns whether or not the passed workspace has any 
     * open projects
     * @return boolean
     */
    private boolean noOpenProjects() {
        IProject[] projects = IDEWorkbenchPlugin.getPluginWorkspace().getRoot()
                .getProjects();
        for (int i = 0; i < projects.length; i++) {
            if (projects[i].isOpen())
                return false;
        }
        return true;
    }
}