Error: writeConcern requires callback [newbie]

Please forgive me such a nub question. 
here is the functions:

var onUpdate = function (err, num, raw) {
    if (!err) {
    logger.info('information stored');
    return myResponse.send ({status: 'ok' });
    } else {
    logger.info (err);
    if(err.name == 'ValidationError') {
            myResponse.statusCode = 400;
            myResponse.send({ error: 'Validation error'});
            logger.info(req.body);
        } else {
            myResponse.statusCode = 500;
            myResponse.send({ error: 'Server error' });
        }
    logger.error('internal error(%d):%s');
    }
}  


function onPostMenuUpdate (request,response) {
   logger.info("In onPostMenuUpdate");
    myResponse=response;
    var menu = new model.MainMenuModel ({
    'name': request.body.name,
    'link': request.body.link,
    'drop': request.body.drop
    }); 
    var menuObject=menu.toObject();
    
    menu.update({name:request.body.name}, menuObject, {upsert: true}, onUpdate);
}

and here is the error message:

info: In onPostMenuUpdate
Error: writeConcern requires callback
    at updateWithWriteCommands (/home/greg/nodejs-module/app/server/node_modules/mongoose/node_modules/mongodb/lib/mongodb/collection/core.js:530:11)
    at Collection.update (/home/greg/nodejs-module/app/server/node_modules/mongoose/node_modules/mongodb/lib/mongodb/collection/core.js:646:12)
    at NativeCollection.(anonymous function) [as update] (/home/greg/nodejs-module/app/server/node_modules/mongoose/lib/drivers/node-mongodb-native/collection.js:135:28)
    at NodeCollection.update (/home/greg/nodejs-module/app/server/node_modules/mongoose/node_modules/mquery/lib/collection/node.js:61:19)
    at Query.update (/home/greg/nodejs-module/app/server/node_modules/mongoose/node_modules/mquery/lib/mquery.js:1939:20)
    at Query.update (/home/greg/nodejs-module/app/server/node_modules/mongoose/lib/query.js:1760:28)
    at Function.update (/home/greg/nodejs-module/app/server/node_modules/mongoose/lib/model.js:1638:13)
    at model.update (/home/greg/nodejs-module/app/server/node_modules/mongoose/lib/document.js:367:34)
    at onPostMenuUpdate (/home/greg/nodejs-module/app/server/requests/postRequests.js:74:10)
    at Layer.handle [as handle_request] (/home/greg/nodejs-module/app/server/node_modules/express/lib/router/layer.js:82:5)

what to do?