human
Solve the following python programming problem given the following code:
def _create_instance_body_of_config_drive(self, param) : 
    self._initialize_extension () 
    def create(* args, **kwargs) : 
        self.assertIn ('config_drive', kwargs) 
        return old_create (* args, ** kwargs) 
old_create = compute_api.API.create 
    self.stubs.Set (compute_api.API, 'create', create) 
    image_href = '76fa36fc-c930-4bf3-8c8a-ea2a2420deb6' 
    flavor_ref = (('http://localhost' + self.base_url) + 'flavors/3') 
    body = { 
        'server' : { 
            'name' : 'config_drive_test', 
            'imageRef' : image_href, 
            'flavorRef' : old_create, 
            'config_drive' : param, 
}, 
} 
    req = fakes.HTTPRequest.blank ((self.base_url + 'servers')) 
    req.method = 'POST' 
    req.body = jsonutils.dump_as_bytes (body) 
    req.headers ['content-type'] = 'application/json' 
    return (req, body) 

    
    

    Fix the buggy line: 'flavorRef' : old_create ,
assistant
#Here is Python program to fix the buggy line: 'flavorRef' : old_create ,
.

'flavorRef' : flavor_ref ,