Error Conecting to Database

[PaigeLynn]

I got Mongo finally and now Im having this issues

 error: NodeBB could not connect to your Mongo database. Mongo returned the following error
MongoError: Authentication failed.
    at /home/ubuntu/nodebb/node_modules/mongodb/node_modules/mongodb-core/lib/connection/pool.js:581:63
    at authenticateStragglers (/home/ubuntu/nodebb/node_modules/mongodb/node_modules/mongodb-core/lib/connection/pool.js:504:16)
    at Connection.messageHandler (/home/ubuntu/nodebb/node_modules/mongodb/node_modules/mongodb-core/lib/connection/pool.js:540:5)
    at emitMessageHandler (/home/ubuntu/nodebb/node_modules/mongodb/node_modules/mongodb-core/lib/connection/connection.js:310:10)
    at Socket.<anonymous> (/home/ubuntu/nodebb/node_modules/mongodb/node_modules/mongodb-core/lib/connection/connection.js:453:17)
    at Socket.emit (events.js:198:13)
    at addChunk (_stream_readable.js:288:12)
    at readableAddChunk (_stream_readable.js:269:11)
    at Socket.Readable.push (_stream_readable.js:224:10)
    at TCP.onStreamRead [as _originalOnread] (internal/stream_base_commons.js:94:17)
2019-08-12T16:15:24.766Z [4280] - warn: NodeBB Setup Aborted.
 MongoError: Authentication failed.
    at /home/ubuntu/nodebb/node_modules/mongodb/node_modules/mongodb-core/lib/connection/pool.js:581:63
    at authenticateStragglers (/home/ubuntu/nodebb/node_modules/mongodb/node_modules/mongodb-core/lib/connection/pool.js:504:16)
    at Connection.messageHandler (/home/ubuntu/nodebb/node_modules/mongodb/node_modules/mongodb-core/lib/connection/pool.js:540:5)
    at emitMessageHandler (/home/ubuntu/nodebb/node_modules/mongodb/node_modules/mongodb-core/lib/connection/connection.js:310:10)
    at Socket.<anonymous> (/home/ubuntu/nodebb/node_modules/mongodb/node_modules/mongodb-core/lib/connection/connection.js:453:17)
    at Socket.emit (events.js:198:13)
    at addChunk (_stream_readable.js:288:12)
    at readableAddChunk (_stream_readable.js:269:11)
    at Socket.Readable.push (_stream_readable.js:224:10)
    at TCP.onStreamRead [as _originalOnread] (internal/stream_base_commons.js:94:17)