Authentication failure while running "npm run start:server"

[chandu526]

[nodemon] 2.0.20
[nodemon] to restart at any time, enter rs
[nodemon] watching path(s): .
[nodemon] watching extensions: js,mjs,json
[nodemon] starting node --inspect=0.0.0.0:3011 ./backend/server.js
Debugger listening on ws://0.0.0.0:3011/31a01e70-21d0-41fd-926f-eb033f8606f5
For help, see: https://nodejs.org/en/docs/inspector
MongoError: Authentication failed.
at MessageStream.messageHandler (Documents\Pharmacy-Mangment-System\backend\node_modules\mongodb\lib\cmap\connection.js:299:20)
at MessageStream.emit (node:events:513:28)
at processIncomingData (Pharmacy-Mangment-System\backend\node_modules\mongodb\lib\cmap\message_stream.js:144:12)
at MessageStream._write (Documents\Pharmacy-Mangment-System\backend\node_modules\mongodb\lib\cmap\message_stream.js:42:5)
at writeOrBuffer (node:internal/streams/writable:391:12)
at _write (node:internal/streams/writable:332:10)
at MessageStream.Writable.write (node:internal/streams/writable:336:10)
at Socket.ondata (node:internal/streams/readable:754:22)
at Socket.emit (node:events:513:28)
at addChunk (node:internal/streams/readable:315:12)
at readableAddChunk (node:internal/streams/readable:289:9)
at Socket.Readable.push (node:internal/streams/readable:228:10)
at TCP.onStreamRead (node:internal/stream_base_commons:190:23) {
ok: 0,
code: 18,
codeName: 'AuthenticationFailed'
}
connection failed!