Error 403 - Permissions

[[{"fid":"849","view_mode":"default","fields":{"format":"default","alignment":"","field_file_image_alt_text[und][0][value]":false,"field_file_image_title_text[und][0][value]":false,"external_url":""},"type":"media","field_deltas":{"3":{"format":"default","alignment":"","field_file_image_alt_text[und][0][value]":false,"field_file_image_title_text[und][0][value]":false,"external_url":""}},"attributes":{"style":"height: 200px; width: 200px;","class":"media-element file-default","data-delta":"3"}}]]