bad auth Authentication failed 에러 질문이요ㅠ

{ MongooseServerSelectionError: bad auth Authentication failed.

[0]     at new MongooseServerSelectionError (C:\Users\jaekyu\Desktop\boilerplate-mern-stack-master\node_modules\mongoose\lib\error\serverSelection.js:22:11)

[0]     at NativeConnection.Connection.openUri (C:\Users\jaekyu\Desktop\boilerplate-mern-stack-master\node_modules\mongoose\lib\connection.js:823:32)

[0]     at Mongoose.connect (C:\Users\jaekyu\Desktop\boilerplate-mern-stack-master\node_modules\mongoose\lib\index.js:333:15)

[0]     at Object. (C:\Users\jaekyu\Desktop\boilerplate-mern-stack-master\server\index.js:18:26)

[0]     at Module._compile (internal/modules/cjs/loader.js:776:30)

[0]     at Object.Module._extensions..js (internal/modules/cjs/loader.js:787:10)

[0]     at Module.load (internal/modules/cjs/loader.js:653:32)

[0]     at tryModuleLoad (internal/modules/cjs/loader.js:593:12)

[0]     at Function.Module._load (internal/modules/cjs/loader.js:585:3)

[0]     at Function.Module.runMain (internal/modules/cjs/loader.js:829:12)

[0]     at startup (internal/bootstrap/node.js:283:19)

[0]     at bootstrapNodeJSCore (internal/bootstrap/node.js:622:3)

[0]   message: 'bad auth Authentication failed.',

[0]   name: 'MongooseServerSelectionError',

[0]   reason:

[0]    TopologyDescription {

[0]      type: 'ReplicaSetNoPrimary',

[0]      setName: null,

[0]      maxSetVersion: null,

[0]      maxElectionId: null,

[0]      servers:

[0]       Map {

[0]         'cluster0-shard-00-02.ujwdv.mongodb.net:27017' => [ServerDescription],

[0]         'cluster0-shard-00-01.ujwdv.mongodb.net:27017' => [ServerDescription],

[0]         'cluster0-shard-00-00.ujwdv.mongodb.net:27017' => [ServerDescription] },

[0]      stale: false,

[0]      compatible: true,

[0]      compatibilityError: null,

[0]      logicalSessionTimeoutMinutes: null,

[0]      heartbeatFrequencyMS: 10000,

[0]      localThresholdMS: 15,

[0]      commonWireVersion: null },

[0]   [Symbol(mongoErrorContextSymbol)]: {} }

이런 에러가 뜹니다 ㅠㅠ ㅠ

localhost:3000 으로 들어가보면

뜨긴뜨는데 로그인버튼 없이 로그아웃으로 떠버리네요ㅠ

몽고디비 접속이 제대로 안된걸까요?ㅠ