type error : options.mongooseConnection.once is not a function

Question

E:\Project\Unofficial_Project\web\node\node-cms\node_modules\connect-mongo\src\index.js:110
          options.mongooseConnection.once('open', () =>
                                     ^
TypeError: options.mongooseConnection.once is not a function

Answer 1

store: new MongoStore({mongooseConnection : mongoose.connection})