simple join

Hi Allan.
I want to show in your datatables+editor, a simple join between two tables. The parent table "tritecno_categorias_mayorista" has a field "mayorista_id" that point to a field "mayorista_id" that is a primary key in the child table "tritecno_mayoristas". I dont want to modify any field in the child table, only show some fields of this child table.

I use this code

$editor = Editor::inst( $db, 'tritecno_categorias_mayorista' )
->fields(
Field::inst( 'mayorista_id' )->set( false )->validator( 'Validate::required' ),
Field::inst( 'mayorista_categoria_id' )->set( false )->validator( 'Validate::required' ),
Field::inst( 'categoria_mayorista' )->set( false )->validator( 'Validate::required' ),
Field::inst( 'subcategoria_mayorista' )->set( false ),
Field::inst( 'virtuemart_category_id' )->validator( 'Validate::required' )
)
->join(
Join::inst( 'tritecno_mayoristas', 'object' )
->join( 'mayorista_id', 'mayorista_id' )
->table('tritecno_mayoristas')
->set( false )
->field(
Field::inst( 'tritecno_mayoristas.mayorista_acro', 'mayorista_acro' )->set( false )
)
)
;


I recieve this error :
DataTables warning (table id = 'example'): DataTables warning: JSON data from server could not be parsed. This is caused by a JSON formatting error.

and in firefox debug the answer to the get.php is this message
Warning</b>: require(C:\xampp\htdocs\tritecno\php\lib/Exception/Exception.php) [<a href='function.require'>function.require</a>]: failed to open stream: No such file or directory in <b>C:\xampp\htdocs\tritecno\php\lib\Bootstrap.php</b> on line <b>40</b>

However If I do this with another child table "ddqfu_virtuemart_categories_es_es" but the same parent table "tritecno_categorias_mayorista", it works. In yhis case I use this parent field "virtuemart_category_id" that point to a field "virtuemart_category_id" in the child table "ddqfu_virtuemart_categories_es_es" that is primary key.

The code that works :

$editor = Editor::inst( $db, 'tritecno_categorias_mayorista' )
->fields(
Field::inst( 'mayorista_id' )->set( false )->validator( 'Validate::required' ),
Field::inst( 'mayorista_categoria_id' )->set( false )->validator( 'Validate::required' ),
Field::inst( 'categoria_mayorista' )->set( false )->validator( 'Validate::required' ),
Field::inst( 'subcategoria_mayorista' )->set( false ),
Field::inst( 'virtuemart_category_id' )->validator( 'Validate::required' )
)
->join(
Join::inst( 'ddqfu_virtuemart_categories_es_es', 'object' )
->join( 'virtuemart_category_id', 'virtuemart_category_id' )
->table('ddqfu_virtuemart_categories_es_es')
->set( false )
->field(
Field::inst( 'ddqfu_virtuemart_categories_es_es.category_name', 'category_name' )->set( false )
)
;

Is the code that I use correct to get the result I want ? If is correct, why in the first case doesn,t works ?

Thanks