Password Reset Error Message

When ever i request a new password for my account this error message appears?

I am trying to get onto my account but cannot remember my email can anyone help?

Warning: call_user_func_array() expects parameter 1 to be a valid callback, class ‘wpFormPlugin’ does not have a method ‘configure_smtp’ in /var/sites/v/vocavoca.co.uk/public_html/wp-includes/plugin.php on line 546

Warning: Cannot modify header information – headers already sent by (output started at /var/sites/v/vocavoca.co.uk/public_html/wp-includes/plugin.php:546) in /var/sites/v/vocavoca.co.uk/public_html/wp-includes/pluggable.php on line 1121