Free Subscription Transaction Error /Warning

I am getting a warning call in my free subscription gateway that is not allowing my transactions to process.

Once my user is registered I redirect them to the subscription payment gateway and nothing happens.

Screen shot attached.

Warning: call_user_func_array() expects parameter 1 to be a valid callback, class 'freesubscriptions' does not have a method 'mytransactions' in /home/svwebdes/public_html/flaseia/wp-includes/plugin.php on line 429