Call to a member function create() on a non-object

I have a MembersController like this:

class MembersController extends MvcPublicController {

public function signup() {
$this->set_object();
}

}

And I have a view for signup like this:

<h2>Membership Signup</h2>
<?php echo $this->form->create($model->name); ?>
<?php echo $this->form->input(‘first_name’); ?>
<?php echo $this->form->input(‘last_name’); ?>
<?php echo $this->form->end(‘Add’); ?>

The view gives me an error:

Fatal error: Call to a member function create() on a non-object in /mysite.com/wp-content/plugins/member-registration/app/views/members/signup.php on line 2

Why does $this in that context not have the form helpers?

http://wordpress.org/plugins/wp-mvc/