Can you help? I have reinstalled the plugin with no luck.

Looking near line 157 I see this below, with line 157 beginning with “for each”:

// counts the number of active GMW widgets in sidebars
  static function count_active_widgets() {
    $count = 0;

    $sidebars = get_option('sidebars_widgets', array());
    foreach ($sidebars as $sidebar_name => $widgets) {
      if (strpos($sidebar_name, 'inactive') !== false || strpos($sidebar_name, 'orphaned') !== false) {
        continue;
      }
      if (is_array($widgets)) {
        foreach ($widgets as $widget_name) {
          if (strpos($widget_name, 'googlemapswidget') !== false) {
            $count++;
          }
        }
      }
    } // foreach sidebar