WordPress WP MVC: MVC Fatal Error: Field “user_id” not found for use in a form input

I am using wordpress 4.1 along with WP MVC.

I have 3 three tables that need to be added with a single form input.

Tables: (prefix for all tables: ‘wp_w2store_’): manufacturers, addresses, countries, zones.

When I choose to add a ‘Manufacturer’, i need to add the fields of address table in the same form and along with that i have to retrieve country_name and zone_name from the respective tables, which are also form the fields list of ‘Address’.

I dont even get the form inputs in the form and i get this error:

MVC Fatal Error: Field “user_id” not found for use in a form input.

since ‘user_id’ is the first foreign field to this form, it alone is shown here. if i remove that field, the error will be shifted to next available field and so on.

In the add() function of admin_manufacturers_controller, i have loaded the model ‘Address’ and set that with all its fields in an array variable, $addresses, as follows:

public function add() {

    $this->set_manufacturers();
    $this->set_addresses();
    $this->create_or_save();
}

private function set_addresses() {

    $this->load_model('Address');
    $addresses = $this->Address->find(array('selects' => array('id', 'user_id', 'first_name', 'last_name',
                                    'address_1', 'address_2', 'email', 'city', 'zip', 'zone_id', 'country_id',
                                    'phone_1', 'phone_2', 'fax', 'type', 'company', 'tax_number', 'customer_note')));
    $this->set('addresses', $addresses);
}

and this is the add.php of manufacturers:

input fields for manufacturers table:

<?php echo $this->form->create($model->name); ?>
<?php echo $this->form->belongs_to_dropdown('Address', $addresses, array('style' => 'width: 200px;', 'empty' => true)); ?>
<?php echo $this->form->input('enabled');?>
<?php echo $this->form->input('ordering');?>

input fields for address table:

<h4>Address Fields</h4>
<?php echo $this->form->input('Address.user_id');?>
<?php echo $this->form->input('Address.first_name');?>
<?php echo $this->form->input('Address.last_name');?>
<?php echo $this->form->input('Address.email');?>
<?php echo $this->form->input('Address.address_1');?>
<?php echo $this->form->input('Address.address_2');?>

and so on…

Since I dont have enough reputation, i dont have privilege to add an image in the question. Kindly bear.

Any suggestions to rectify this issue is thankfully welcome.