Cannot log in to WordPress wp-admin after including code to features.php

I’m including the next code to the top of my features.php file to populate a taxonomy based mostly on a Customized submit’s post-title. The issue is that after I add the code I get the next error attempting to login on wp-admin. Any assist determining why that is taking place is vastly appreciated.

Error:

Error: Cookies are blocked resulting from sudden output. For assist, please see this documentation or attempt the assist boards.

Code:

<?php

perform update_custom_terms($post_id) {

  // solely replace phrases if it is a 'artist' submit
  if ( 'artist' != get_post_type($post_id)) {
    return;
  
  // do not create or replace phrases for system generated posts
  if (get_post_status($post_id) == 'auto-draft') {
    return;
  }
    
 
  $term_title = get_the_title($post_id);
  $term_slug = get_post( $post_id )->post_name;

  /*
  * Test if a corresponding time period already exists by evaluating 
  * the submit ID to all present time period descriptions.
    'artists' is the taxonomy getting populated
  */
  $existing_terms = get_terms('artists', array('hide_empty' => false));

  foreach($existing_terms as $time period) {
    if ($term->description == $post_id) {
      //time period already exists, so replace it and we're completed
      wp_update_term($term->term_id, 'artists', array(
        'identify' => $term_title,
        'slug' => $term_slug
        )
      );
      return;
    }
  }

  /* 
  * If we did not discover a match above, it is a new submit, 
  * so create a brand new time period.
  */
  wp_insert_term($term_title, 'artists', array(
    'slug' => $term_slug,
    'description' => $post_id
    )
  );
}

//run the replace perform at any time when a submit is created or edited
add_action('save_post', 'update_custom_terms');

perform delete_term( $post_id ) {

  $submit = get_post( $post_id );

  if ( time period exists( $post->post_title, 'artists' ) ) {
    $time period = get_term_by( 'identify', $post->post_title, 'artists' );
    wp_delete_term( $term->term_id, 'artists' );
  }

}
add_action( 'before_delete_post', 'delete_term' );
?>