Error when trying to log in with SCLogin

I get an error message when trying to log in with SCLogin. What should I do, please? Here is the error message that I get:

Notice: Undefined variable: gantry in /mnt/data/vhosts/howlingwilderness.com/httpdocs/templates/ca_cloudbase2_j25/html/com_users/login/default_login.php on line 15

Fatal error: Call to a member function init() on a non-object in /mnt/data/vhosts/howlingwilderness.com/httpdocs/templates/ca_cloudbase2_j25/html/com_users/login/default_login.php on line 15

Hello Alex,
Only for the record:

.- The SCLogin working very well if you have activated (my case working with Jfusion and phpbb3) "Allow mods direct access = yes" and "showRedirectMod = on" in Jfusion settings.
In the above case, you can use SCLogin to enter in the site with username and password without login with jfb or jlinked necessarily. BUT, if you don't have activated the above settings, and using your indication in this post to janrup, you no obtain the error message "...call to a member function init" (related to gantry) but you still receive the message "joomla_int Session Create: you are not authorized..."

If I discovered additional information, I'll post here.

Regards.

Juan Manuel