The "pdf_reader_file" plugin does not exist. Valid plugin IDs for Drupal\Core\Field\FormatterPluginManager are: comment_default, comment_username, comment_permalink, datetime_plain, datetime_default, datetime_custom, datetime_time_ago, entity_reference_revisions_entity_view, file_url_plain, file_video, file_table, file_default, file_link, file_rss_enclosure, file_extension, file_filemime, file_size, file_audio, file_uri, fontawesome_icon_formatter, fontawesome_iconpicker_formatter_type, image_url, image, link_separate, link, media_thumbnail, oembed, list_default, list_key, photos_album, photos_image_media, photos_image, entity_reference_rss_category, text_summary_or_trimmed, text_trimmed, text_default, user_name, author, virtual_tour, webform_entity_reference_url, webform_entity_reference_link, webform_entity_reference_entity_view, paragraph_summary, uri_link, entity_reference_label, number_decimal, string, timestamp, number_unformatted, timestamp_ago, basic_string, entity_reference_entity_view, language, boolean, email_mailto, number_integer, entity_reference_entity_id (/home/uogedugy/public_html/subdomains/sandbox/core/lib/Drupal/Component/Plugin/Discovery/DiscoveryTrait.php:53)