이런 에러가 뜨는데 어떤 이유일까요?

Example app listening on port 5000!

MongoParseError: URI does not have hostname, domain name and tld

    at parseSrvConnectionString (/Users/ynsn/Documents/boiler-plate/node_modules/mongodb/lib/core/uri_parser.js:51:21)

    at parseConnectionString (/Users/ynsn/Documents/boiler-plate/node_modules/mongodb/lib/core/uri_parser.js:595:12)

    at connect (/Users/ynsn/Documents/boiler-plate/node_modules/mongodb/lib/operations/connect.js:281:3)

    at /Users/ynsn/Documents/boiler-plate/node_modules/mongodb/lib/mongo_client.js:256:5

    at maybePromise (/Users/ynsn/Documents/boiler-plate/node_modules/mongodb/lib/utils.js:685:3)

    at MongoClient.connect (/Users/ynsn/Documents/boiler-plate/node_modules/mongodb/lib/mongo_client.js:252:10)

    at /Users/ynsn/Documents/boiler-plate/node_modules/mongoose/lib/connection.js:835:12

    at new Promise (<anonymous>)

    at NativeConnection.Connection.openUri (/Users/ynsn/Documents/boiler-plate/node_modules/mongoose/lib/connection.js:832:19)

    at /Users/ynsn/Documents/boiler-plate/node_modules/mongoose/lib/index.js:350:10

    at /Users/ynsn/Documents/boiler-plate/node_modules/mongoose/lib/helpers/promiseOrCallback.js:31:5

    at new Promise (<anonymous>)

    at promiseOrCallback (/Users/ynsn/Documents/boiler-plate/node_modules/mongoose/lib/helpers/promiseOrCallback.js:30:10)

    at Mongoose._promiseOrCallback (/Users/ynsn/Documents/boiler-plate/node_modules/mongoose/lib/index.js:1154:10)

    at Mongoose.connect (/Users/ynsn/Documents/boiler-plate/node_modules/mongoose/lib/index.js:349:20)

    at Object.<anonymous> (/Users/ynsn/Documents/boiler-plate/index.js:6:10)