WordPress Fatal error: require(): Failed opening required

( ! ) Fatal error: require(): Failed opening required ” (include_path=’.:/usr/share/php:/usr/share/pear’) in /var/www/html/wordpress/wp-content/plugins/wp-mvc/core/controllers/mvc_controller.php on line 265

I get this above error despite trying so many suggestions in the forums, stackexchange etc.

I developing a plugin in WordPress 4.0.1 using WP MVC, and it also encapsulates ORM concept that is in-built with WP MVC. I couldnt find a solution for this.
Below is the code: (Admin Controller)

/plugins/w2-store/app/controllers/admin/admin_geozone_rules_controller.php

class AdminGeozoneRulesController extends AdminController {

    // Default items in Geozone Rules view
    var $default_columns = array(
                                'id',
                                'Geozone' => array('value_method' => 'admin_column_geozone'),
                                'Country' => array('value_method' => 'admin_column_country'),
                                'Zone' => array('value_method' => 'admin_column_zone'),
                                'ordering');

    // Function to add a new record in wp_w2store_geozonerules table
    public function add() {
        $this->set_geozones();
        $this->set_countries();
        $this->set_zones();
        $this->set_geozonerules();
        $this->create_or_save();
    }

    public function edit() {
        $this->set_geozonerules();
        $this->set_geozones();
        $this->set_countries();
        $this->set_zones();
        $this->set_object();
        $this->verify_id_param();
        $this->create_or_save();
    }

    // Function to display the Country name Geozone Rules view
    public function admin_column_country($object) {
        return $object->country->country_name;
    }

    // Function to display the Geozone name Geozone Rules view
    public function admin_column_geozone($object) {
        return $object->geozone->geozone_name;
    }

    // Function to display the Zone name Geozone Rules view
    public function admin_column_zone($object) {
        return $object->zone->zone_name;
    }

    // Data retreived from four different tables using joins
    private function set_geozonerules() {

        $this->load_model('GeozoneRule');
        $geozonerules = $this->GeozoneRule->find(array(
                                                'joins' => array(
                                                'Geozone', 'Country', 'Zone'
                                                ),
                                                'includes' => array(
                                                'Geozone', 'Country', 'Zone'
                                                ),
                                                'selects' => array(
                                                                'Geozone.id', 'Geozone.geozone_name',
                                                                'Country.id', 'Country.country_name',
                                                                'Zone.id', 'Zone.zone_name',
                                                                'GeozoneRule.id', 'GeozoneRule.ordering'
    /*                                                          ),
                                                'conditions' => array(
                                                                    'GeozoneRule.geozone_id' => 'Geozone.id',
                                                                    'GeozoneRule.country_id' => 'Country.id',
                                                                    'GeozoneRule.zone_id'    => 'Zone.id'
    */                                                          )
                                                        )
                                                );

        $this->set('geozonerules', $geozonerules);
    }

    private function set_geozones() {
        $this->load_model('Geozone');
        $geozones = $this->Geozone->find(array(
                                        'selects' => array(
                                        'id',
                                        'geozone_name'
                                        )
                                        ));
        $this->set('geozones', $geozones);
    }

    private function set_countries() {
        $this->load_model('Country');
        $countries = $this->Country->find(array(
                                        'selects' => array(
                                        'id',
                                        'country_name'
                                        )
                                        ));
        $this->set('countries', $countries);
    }

    private function set_zones() {

        $this->load_model('Zone');
        $zones = $this->Zone->find(array(
                                    'selects' => array(
                                    'id',
                                    'zone_name'
                                    )
                                    ));
        $this->set('zones', $zones);
    }   

    public function geozonerule_edit_link($object) {
        return empty($object->geozonerule) ? null
                                            : HtmlHelper::admin_object_link($object->geozonerule,
                                                array('action' => 'edit'));
    }

    public function geozonerule_view_link($object) {
        return empty($object->geozonerule) ? null
                                            : HtmlHelper::admin_object_link($object->geozonerule,
                                                array('action' => 'view'));
    }

}

?>

(Public Controller)

/plugins/w2-store/app/controllers/geozone_rules_controller.php

class GeozoneRulesController extends MvcPublicController {

    var $after = array('set_geozonerules');

        public function set_geozonerules() {
            $this->load_model('GeozoneRule');
            $geozonerules = $this->GeozoneRule->find();
            $this->set('geozonerules', $geozonerules);
        }

        // Overwrite the default index() method to include the 'is_public' => true condition
        public function index() {

        $objects = $this->GeozoneRule->find(array(
                                    'joins'     =>  array('Geozone', 'Country', 'Zone'),
                                    'includes'  =>  array('Geozone', 'Country', 'Zone'),
                                    'selects'   =>  array('Geozone.id, Geozone.geozone_name',
                                                    array('Country.id, Country.country_name',
                                                    array('Zone.id', 'Zone.zone_name',
                                                    array('GeozoneRule.id', 'GeozoneRule.ordering')
                                                    )
                                            )))
                                    );
        $this->set('objects', $objects);

        // pagination
        $this->params['page'] = empty($this->params['page']) ? 1 : $this->params['page'];
        $this->params['conditions'] = array('is_public' => true);
        $collection = $this->model->paginate($this->params);
        $this->set('objects', $collection['objects']);
        $this->set_pagination($collection);

        echo '<a href="admin.php?page=mvc_geozone_rules-add">Add New Geozone Rule</a>';

    }

    // GeozoneRule selects only GeozoneRule names and ids by default; to select all fields from GeozoneRule,
    // we'll overwrite the default show() method
    public function show() {

        $object = $this->model->find_by_id($this->params['id'], array(
            'includes' => array(
                            'Geozone',
                            'Country',
                            'Zone',
                            'GeozoneRule' => array(
                                                'selects' => 'GeozoneRule.*'
                                                )
                            )
                            ));

        if (!empty($object)) {
            $this->set('object', $object);
            $this->render_view('show', array('layout' => 'public'));
        }
    }
}

?>

Model:

class GeozoneRule extends MvcModel {

    var $table = '{prefix}w2store_geozonerules';
    var $primary_key = 'id';
    var $display_field = 'id';
    var $default_order = 'sort_name';
    var $includes = array('Geozone', 'Country', 'Zone');

    var $has_and_belongs_to_many = array(
                        'GeozoneRule' => array(
                                        'join_table' => array('{prefix}w2store_geozones',
                                                            'fields' => array('id', 'geozone_name')),
                                                        array('{prefix}w2store_countries',
                                                            'fields' => array('id', 'country_name')),
                                                        array('{prefix}w2store_zones',
                                                            'fields' => array('id', 'zone_name')),
                                                            'fields' => array('id', 'ordering')
                                                            )
                                        );

    public function after_find($object) {
        if (isset($object->geozonerules)) {
            $geozonerule_names = array();
            foreach($object->geozonerules as $geozonerule) {
                $geozonerule_names[] = $geozonerule->name;
            }
        }

    //  print_r ($object);
    //  exit;
    }

    public function after_save($object) {
        $this->update_sort_name($object);
    }

    public function update_sort_name($object) {

        $sort_name = $object->geozonerule_name;
        $this->update($object->__id, array('sort_name' => $sort_name));
    }

}

?>

Now the error i got:

`Warning: require(): Filename cannot be empty in /var/www/html/wordpress/wp-content/plugins/wp-mvc/core/controllers/mvc_controller.php
on line 265 Call Stack Time Memory Function Location . . 11 0.0659 3870616 require( ‘/var/www/html/wordpress/wp-content/plugins/w2- . .

Fatal error: require(): Failed opening required ” (include_path=’.:/usr/share/php:/usr/share/pear’) in
/var/www/html/wordpress/wp-content/plugins/wp-mvc/core/controllers/mvc_controller.php on line 265 Call Stack Time Memory Function Location . . 11 0.0659 3870616 require( ‘/var/www/html/wordpress/wp-content/plugins/w2-store/app/views/admin/layouts/admin.php’ ) ../mvc_controller.php:265 . .

Any possible solutions will be of much help. Thanks a lot.