Trying to install it directly to a theme problem

[ThinkDevStudios]

Hi! I am having problems trying integrate this with a theme. I am using a themosis framework.
themosis_path('app') -> returns the theme directory.

add_action('acf/register_fields', 'my_register_fields');
function my_register_fields()
{
include_once( themosis_path('app').'addons/acf/acf-date_time_picker/acf-date_time_picker.php');
}

I am currently using easyphp and localserver with virtual domain. do i need to enable or activate a apache config to make this work?