Sorry it took so long to get back to you. There were a few problems with your code, you have some extra nesting on arrays() is isn’t needed in places. Also I learned that if you’re adding fields using acf_add_local_field() that you need to add fields to a repeater, you can’t just add the repeater including the sub fields, what that means is that each individual field must be added separately.
this code works
if( function_exists('acf_add_local_field_group') ) {
acf_add_local_field_group(
array (
'key' => 'group_56ff5b11d1775',
'title' => 'add component',
'fields' => array (
array (
'key' => 'field_56ff5b1a77c75',
'label' => 'flexible content',
'name' => 'flexible_content',
'type' => 'flexible_content',
'instructions' => '',
'wrapper' => array (
'width' => '',
'class' => '',
'id' => '',
),
'button_label' => 'Add Row',
'min' => '',
'max' => '',
'layouts' => array (
array (
'key' => '56ff5b1a77c76',
'name' => 'sample_label',
'label' => 'sample label',
'display' => 'block',
'min' => '',
'max' => '',
),
),
),
),
'location' => array (
array (
array (
'param' => 'post_type',
'operator' => '==',
'value' => 'post',
),
),
),
'menu_order' => 0,
'position' => 'normal',
'style' => 'default',
'label_placement' => 'top',
'instruction_placement' => 'label',
'hide_on_screen' => '',
'active' => 1,
'description' => '',
)
);
acf_add_local_field(
array (
'key' => 'field_56ff5b1a77c79',
'label' => 'Repeatable image with optional link',
'name' => 'repeatable_imgs',
'type' => 'repeater',
'parent' => 'field_56ff5b1a77c75', //flex field key
'parent_layout' => '56ff5b1a77c76', // layout key
'row_min' => 0,
'row_limit' => '',
'layout' => 'table',
'button_label' => 'Add image',
)
);
acf_add_local_field(
array (
'key' => 'field_5237950f6c6e4',
'label' => 'url',
'name' => 'img_link_url',
'type' => 'text',
'parent' => 'field_56ff5b1a77c79',
)
);
}
