This guide is applicable for OpenCart 1.5.x installation only.
index.php with your preferred text editor.
2 Find the following two lines (approximately line 220):
// Front Controller $controller = new Front($registry);
3 Insert these two lines right after:
// TB $controller->dispatch(new Action('common/tb_themes', array('front' => $controller)), new Action('error/not_found'));
4 Save the file