In file wordpress-access-control.php in line 614 I changed
if (isset($args[‘walker’]) && get_class($args[‘walker’]) == ‘WpacSecureWalker’) {
to
if (isset($args[‘walker’]) ) {
I know this could break your site if you have a configured menu, but my site does not have a configured menu. This made my menu work and got rid of the error:
Warning: get_class() expects parameter 1 to be object, string given
