Jetpack related post not working

ive activate it but its not working
my site: http://www.tvqc.com/

also when im click the related post section when the window is poping up i get this erreir message: Warning: call_user_func_array() expects parameter 1 to be a valid callback, function ‘vaultpress_jetpack_more_info_connected’ not found or invalid function name in /home/domains/tvqc.com/wp-includes/plugin.php on line 470

https://wordpress.org/plugins/jetpack/