Warning: file_exists() expects parameter 1 to be string, array given in ctools_get_plugins()

After I installed purl and kept getting this warning in all pages:

Warning: file_exists() expects parameter 1 to be string, array given in ctools_get_plugins() (line 247 of /var/www/drupal/sites/all/modules/contrib/ctools/includes/plugins.inc).

Line 247 at plugins.inc:

if (isset($cache->data['path']) && file_exists($cache->data['path'])) {

I looked in Purl,  purl.module line 958 and realizde PURL is using

  $info['path'] = array(
    'title' => t('Path'),

So i changed to

  $info['purlpath'] = array(
    'title' => t('Path'),

But I don't know if this change cause problems or not.