Field group on import

Exporting a field group with child items seems to work fine into the file, but when importing it produces the following errors and the field group loses it's label in the manage fields view on user account page and the child fields are not under it

Notice: Undefined property: stdClass::$label in field_group_pack() (line 1531 of /Applications/XAMPP/xamppfiles/htdocs/stat/sites/all/modules/contrib/field_group/field_group.module).
Notice: Undefined property: stdClass::$weight in field_group_pack() (line 1532 of /Applications/XAMPP/xamppfiles/htdocs/stat/sites/all/modules/contrib/field_group/field_group.module).
Notice: Undefined property: stdClass::$children in field_group_pack() (line 1533 of /Applications/XAMPP/xamppfiles/htdocs/stat/sites/all/modules/contrib/field_group/field_group.module).

Here's the inc file

<?php
/**
* @file
* field_group.group_user_personal|user|user|form.inc
*/

$api = '2.0.0';

$data = $field_group = new stdClass();
$field_group->disabled = FALSE; /* Edit this to true to make a default field_group disabled initially */
$field_group->api_version = 1;
$field_group->identifier = 'group_user_personal|user|user|form';
$field_group->group_name = 'group_user_personal';
$field_group->entity_type = 'user';
$field_group->bundle = 'user';
$field_group->mode = 'form';
$field_group->parent_name = '';
$field_group->data = array(
'label' => 'Personal',
'weight' => '3',
'children' => array(
0 => 'field_first_name',
1 => 'field_last_name',
2 => 'field_membership_number',
3 => 'field_user_title',
),
'format_type' => 'fieldset',
'format_settings' => array(
'label' => 'Personal',
'instance_settings' => array(
'required_fields' => 1,
'classes' => '',
'description' => '',
),
'formatter' => 'collapsible',
),
);

$dependencies = array();

$optional = array();

$modules = array(
0 => 'ctools',
1 => 'field_group',
);