Fatal error: Call to undefined function _photos_access_pass_type

First the album photos is not working in anonymous user. But it is working fine without error in authenticated user.

Album photos in anonymous user display only the filename of an image and after clicking that link this error message appear:

Fatal error: Call to undefined function _photos_access_pass_type() in /home/myuser/public_html/mysite.com/sites/all/modules/photos/photos.module on line 298

I repeat I did not encounter this error in an authenticated user.