Backend crashes on launching front end

[songproducer]

(base) leotreasure@Leos-MBP backend % node main 3001

mongodb+srv://admin:undefined@postax.a1vpe.mongodb.net/AnalysisDep?retryWrites=true&w=majority
mongodb+srv://admin:undefined@postax.a1vpe.mongodb.net/AnalysisDep?retryWrites=true&w=majority
the options [userFindAndModify] is not supported
express-validator: requires to express-validator/check are deprecated.You should just use require("express-validator") instead.
(node:89785) Warning: Accessing non-existent property 'MongoError' of module exports inside circular dependency
(Use `node --trace-warnings ...` to show where the warning was created)
App Listening on port 3001

(base) leotreasure@Leos-MBP frontend % npm start

Database connection error MongooseServerSelectionError: Could not connect to any servers in your MongoDB Atlas cluster. One common reason is that you're trying to access the database from an IP that isn't whitelisted. Make sure your current IP address is on your Atlas cluster's IP whitelist: https://docs.atlas.mongodb.com/security-whitelist/
/Users/leotreasure/CryptoCount/backend/node_modules/mongoose/lib/connection.js:839
  const serverSelectionError = new ServerSelectionError();
                               ^

MongooseServerSelectionError: Could not connect to any servers in your MongoDB Atlas cluster. One common reason is that you're trying to access the database from an IP that isn't whitelisted. Make sure your current IP address is on your Atlas cluster's IP whitelist: https://docs.atlas.mongodb.com/security-whitelist/
    at NativeConnection.Connection.openUri (/Users/leotreasure/CryptoCount/backend/node_modules/mongoose/lib/connection.js:839:32)
    at /Users/leotreasure/CryptoCount/backend/node_modules/mongoose/lib/index.js:348:10
    at /Users/leotreasure/CryptoCount/backend/node_modules/mongoose/lib/helpers/promiseOrCallback.js:31:5
    at new Promise (<anonymous>)
    at promiseOrCallback (/Users/leotreasure/CryptoCount/backend/node_modules/mongoose/lib/helpers/promiseOrCallback.js:30:10)
    at Mongoose._promiseOrCallback (/Users/leotreasure/CryptoCount/backend/node_modules/mongoose/lib/index.js:1140:10)
    at Mongoose.connect (/Users/leotreasure/CryptoCount/backend/node_modules/mongoose/lib/index.js:347:20)
    at InitiateMongoServer (/Users/leotreasure/CryptoCount/backend/config/db.js:12:18)
    at Object.<anonymous> (/Users/leotreasure/CryptoCount/backend/main.js:13:1)
    at Module._compile (node:internal/modules/cjs/loader:1097:14)
    at Object.Module._extensions..js (node:internal/modules/cjs/loader:1149:10)
    at Module.load (node:internal/modules/cjs/loader:975:32)
    at Function.Module._load (node:internal/modules/cjs/loader:822:12)
    at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:81:12)
    at node:internal/main/run_main_module:17:47 {
  reason: TopologyDescription {
    type: 'ReplicaSetNoPrimary',
    setName: null,
    maxSetVersion: null,
    maxElectionId: null,
    servers: Map(3) {
      'postax-shard-00-01.a1vpe.mongodb.net:27017' => ServerDescription {
        address: 'postax-shard-00-01.a1vpe.mongodb.net:27017',
        error: MongoNetworkError: connection <monitor> to 3.222.228.106:27017 closed
            at /Users/leotreasure/CryptoCount/backend/node_modules/mongodb/lib/cmap/connection.js:68:15
            at Map.forEach (<anonymous>)
            at TLSSocket.<anonymous> (/Users/leotreasure/CryptoCount/backend/node_modules/mongodb/lib/cmap/connection.js:67:20)
            at TLSSocket.emit (node:events:390:28)
            at node:net:687:12
            at TCP.done (node:_tls_wrap:580:7),
        roundTripTime: -1,
        lastUpdateTime: 1875631116,
        lastWriteDate: null,
        opTime: null,
        type: 'Unknown',
        topologyVersion: undefined,
        minWireVersion: 0,
        maxWireVersion: 0,
        hosts: [],
        passives: [],
        arbiters: [],
        tags: []
      },
      'postax-shard-00-02.a1vpe.mongodb.net:27017' => ServerDescription {
        address: 'postax-shard-00-02.a1vpe.mongodb.net:27017',
        error: MongoNetworkError: connection <monitor> to 54.205.212.181:27017 closed
            at /Users/leotreasure/CryptoCount/backend/node_modules/mongodb/lib/cmap/connection.js:68:15
            at Map.forEach (<anonymous>)
            at TLSSocket.<anonymous> (/Users/leotreasure/CryptoCount/backend/node_modules/mongodb/lib/cmap/connection.js:67:20)
            at TLSSocket.emit (node:events:390:28)
            at node:net:687:12
            at TCP.done (node:_tls_wrap:580:7),
        roundTripTime: -1,
        lastUpdateTime: 1875631198,
        lastWriteDate: null,
        opTime: null,
        type: 'Unknown',
        topologyVersion: undefined,
        minWireVersion: 0,
        maxWireVersion: 0,
        hosts: [],
        passives: [],
        arbiters: [],
        tags: []
      },
      'postax-shard-00-00.a1vpe.mongodb.net:27017' => ServerDescription {
        address: 'postax-shard-00-00.a1vpe.mongodb.net:27017',
        error: MongoNetworkError: connection <monitor> to 34.233.192.55:27017 closed
            at /Users/leotreasure/CryptoCount/backend/node_modules/mongodb/lib/cmap/connection.js:68:15
            at Map.forEach (<anonymous>)
            at TLSSocket.<anonymous> (/Users/leotreasure/CryptoCount/backend/node_modules/mongodb/lib/cmap/connection.js:67:20)
            at TLSSocket.emit (node:events:390:28)
            at node:net:687:12
            at TCP.done (node:_tls_wrap:580:7),
        roundTripTime: -1,
        lastUpdateTime: 1875630407,
        lastWriteDate: null,
        opTime: null,
        type: 'Unknown',
        topologyVersion: undefined,
        minWireVersion: 0,
        maxWireVersion: 0,
        hosts: [],
        passives: [],
        arbiters: [],
        tags: []
      }
    },
    stale: false,
    compatible: true,
    compatibilityError: null,
    logicalSessionTimeoutMinutes: null,
    heartbeatFrequencyMS: 10000,
    localThresholdMS: 15,
    commonWireVersion: null
  }
}

Node.js v17.2.0