hook_field_formatter_view does not get called

I have a custom field, that hooks into profile2 and saves it’s value in user data blob. Everything works fine, except the hook_field_formatter_view, that does not get called for a reason. As a result, when the field is viewed, it returns always an empty array. I have all declaration hooks in place.

<?php   /**   * Implementation of hook_field_info().   */  function profile_cal_field_info() {   return array(     'profile_cal' => array(       'label' => t('Availability calendar'),       'description' => t('Sets weekly available time.'),       'default_widget' => 'profile_cal_cal',       'default_formatter' => 'profile_cal_formatter',     ),   );  }    /**  * Implements hook_field_formatter_info().  */  function profile_cal_field_formatter_info() {   return array(     'profile_cal_formatter' => array(       'label' => t('Default'),       'field types' => array('profile_cal'),     ),   );  }   /**  * Implements hook_field_widget_info().  */  function profile_cal_field_widget_info() {   return array(     'profile_cal_cal' => array(       'label' => t('Availability widget'),       'field types' => array('profile_cal'),       'multiple values' => FIELD_BEHAVIOR_DEFAULT,       'default value' => FIELD_BEHAVIOR_NONE,     ),   ); }   /**  * Implements hook_field_formatter_view().  */  function profile_cal_field_formatter_view($entity_type, $entity, $field,     $instance, $langcode, $items, $display) {   drupal_set_message('Called!');    $element = array();    return $element;  }   /**  * Implements hook_field_is_empty().  */  function profile_cal_field_is_empty($item, $field) {   return FALSE;  }   ?> 
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