conflicts with registration helper

I can’t seem to get this to work with my site. After i put my code together when I’m saving my buddypress profile on the frontend I get this error:

Warning: Cannot modify header information – headers already sent by (output started at /home3/dduser/dev.friendometry.com/wp-content/plugins/pmpro-buddypress/includes/profiles.php:56) in /home3/dduser/dev.friendometry.com/wp-includes/pluggable.php on line 1219

here is the code i added to my functions.php

/**
 * Based on the Register Helper example.
 * We've added a "buddypress" option for each field set to the XProfile name we used when setting up
 * the fields in the BuddyPress extended profile.
 * If the PMPro BuddyPress Add On is activated then the fields will be synchronized.
 * Register Helper: https://www.paidmembershipspro.com/add-ons/pmpro-register-helper-add-checkout-and-profile-fields/
 * PMPro BuddyPress: https://www.paidmembershipspro.com/add-ons/buddypress-integration/
 */
function my_pmprorh_init() {
	// don't break if Register Helper is not loaded
	if ( ! function_exists( 'pmprorh_add_registration_field' ) ) {
		return false;
	}

	// define the fields
	$fields = array();
	$fields[] = new PMProRH_Field(
		'rt_childname',                 // input name, will also be used as meta key
		'text',                         // type of field
		array(
			'buddypress' => 'A Catchy User Name',      // XProfile Field Name
			'label'     => 'A Catchy User Name for your child',       // custom field label
			'profile'   => true,            // show in user profile
			'required'  => true,            // make this field required
		)
	);

	// add the fields into a new checkout_boxes are of the checkout page
	foreach ( $fields as $field ) {
		pmprorh_add_registration_field(
			'checkout_boxes',               // location on checkout page
			$field                          // PMProRH_Field object
		);
	}
	// that's it. see the PMPro Register Helper readme for more information and examples.
}
add_action( 'init', 'my_pmprorh_init' );

can you tell what I did wrong?