Cloner Error - 'WPMUDEV_Cloner' does not have a method 'add_blogname_suffix'

Cloner WAS working fine before I upgraded the plugin. Now I am getting the following on-screen error. "Warning: call_user_func_array() expects parameter 1 to be a valid callback, class 'WPMUDEV_Cloner' does not have a method 'add_blogname_suffix'"

And the following error logged in the server error logs, "[Thu Sep 04 13:21:11 2014] [warn] [client 71.95.104.176] mod_fcgid: stderr: PHP Warning: call_user_func_array() expects parameter 1 to be a valid callback, class 'WPMUDEV_Cloner' does not have a method 'add_blogname_suffix' in /var/www/vhosts/****(omitted).com/httpdocs/wp-includes/plugin.php on line 470

Any ideas how to fix this?