Click to call docs giving wordpress error

@missveronicatv thanks
What bout Caps in email snippet, is that too removed?

@missveronicatv this one

function um_102621_blockedemails( $args ) {
$emails = UM()->options()->get( 'blocked_emails' );
if ( ! $emails ) {
    return;
}

$emails = array_map( 'rtrim', explode( "\n", $emails ) );

if ( isset( $args['user_email'] ) && is_email( $args['user_email'] ) ) {

    $domain = explode( '@', $args['user_email'] );
    $check_domain = str_replace( $domain[0], '*', $args['user_email'] );

    if ( in_array( strtolower( $args['user_email'] ), $emails ) ) {
        exit( wp_redirect( esc_url( add_query_arg( 'err', 'blocked_email' ) ) ) );
    }

    if ( in_array( strtolower( $check_domain ), $emails ) ) {
        exit( wp_redirect( esc_url( add_query_arg( 'err', 'blocked_domain' ) ) ) );
    }

}
if ( isset( $args['username'] ) && is_email( $args['username'] ) ) {

    $domain = explode( '@', $args['username'] );
    $check_domain = str_replace( $domain[0], '*', $args['username'] );

    if ( in_array( strtolower( $args['username'] ), $emails ) ) {
        exit( wp_redirect( esc_url( add_query_arg( 'err', 'blocked_email' ) ) ) );
    }

    if ( in_array( strtolower( $check_domain ), $emails ) ) {
        exit( wp_redirect( esc_url( add_query_arg( 'err', 'blocked_domain' ) ) ) );
    }
}
}
add_action( 'um_submit_form_errors_hook__blockedemails', 'um_102621_blockedemails', 10 );
remove_action( 'um_submit_form_errors_hook__blockedemails', 'um_submit_form_errors_hook__blockedemails', 10 );