[question] how to set env variables

[itsmysyntax]

bro after doing all the steps you mentioned .

i got this mongo error can you tell what does this mean

`✔ WEB Server started at: http://localhost:3000
✔ Browse your REST API at: http://localhost:3000/explorer

Connection fails: MongoNetworkError: failed to connect to server [localhost:27017] on first connect [MongoError: password must be a string
at passwordDigest (/home/lol/Documents/node_dev/flex-originals/node_modules/mongodb/lib/core/auth/scram.js:32:43)
at ScramSHA1._executeScram (/home/lol/Documents/node_dev/flex-originals/node_modules/mongodb/lib/core/auth/scram.js:163:29)
at AsyncWrap. (/home/lol/Documents/node_dev/flex-originals/node_modules/mongodb/lib/core/auth/scram.js:276:19)
at AsyncWrap.wrap.ondone (internal/crypto/random.js:62:8) {
name: 'MongoError',
[Symbol(mongoErrorContextSymbol)]: {}
}]
It will be retried for the next request.
/home/lol/Documents/node_dev/flex-originals/node_modules/mongodb/lib/topologies/server.js:233
throw err;
^

MongoNetworkError: failed to connect to server [localhost:27017] on first connect [MongoError: password must be a string
at passwordDigest (/home/lol/Documents/node_dev/flex-originals/node_modules/mongodb/lib/core/auth/scram.js:32:43)
at ScramSHA1._executeScram (/home/lol/Documents/node_dev/flex-originals/node_modules/mongodb/lib/core/auth/scram.js:163:29)
at AsyncWrap. (/home/lol/Documents/node_dev/flex-originals/node_modules/mongodb/lib/core/auth/scram.js:276:19)
at AsyncWrap.wrap.ondone (internal/crypto/random.js:62:8) {
name: 'MongoError',
[Symbol(mongoErrorContextSymbol)]: {}
}]
at Pool. (/home/lol/Documents/node_dev/flex-originals/node_modules/mongodb/lib/core/topologies/server.js:438:11)
at Pool.emit (events.js:321:20)
at Pool.EventEmitter.emit (domain.js:482:12)
at /home/lol/Documents/node_dev/flex-originals/node_modules/mongodb/lib/core/connection/pool.js:561:14
at /home/lol/Documents/node_dev/flex-originals/node_modules/mongodb/lib/core/connection/pool.js:994:11
at callback (/home/lol/Documents/node_dev/flex-originals/node_modules/mongodb/lib/core/connection/connect.js:97:5)
at /home/lol/Documents/node_dev/flex-originals/node_modules/mongodb/lib/core/connection/connect.js:396:21
at /home/lol/Documents/node_dev/flex-originals/node_modules/mongodb/lib/core/auth/auth_provider.js:66:11
at ScramSHA1._executeScram (/home/lol/Documents/node_dev/flex-originals/node_modules/mongodb/lib/core/auth/scram.js:165:16)
at AsyncWrap. (/home/lol/Documents/node_dev/flex-originals/node_modules/mongodb/lib/core/auth/scram.js:276:19)
at AsyncWrap.wrap.ondone (internal/crypto/random.js:62:8)
Emitted 'error' event on DataSource instance at:
at DataSource.postInit (/home/lol/Documents/node_dev/flex-originals/node_modules/loopback-datasource-juggler/lib/datasource.js:489:16)
at onError (/home/lol/Documents/node_dev/flex-originals/node_modules/loopback-connector-mongodb/lib/mongodb.js:316:21)
at /home/lol/Documents/node_dev/flex-originals/node_modules/loopback-connector-mongodb/lib/mongodb.js:324:9
at executeCallback (/home/lol/Documents/node_dev/flex-originals/node_modules/mongodb/lib/operations/execute_operation.js:74:5)
at /home/lol/Documents/node_dev/flex-originals/node_modules/mongodb/lib/operations/connect.js:209:23
at connectCallback (/home/lol/Documents/node_dev/flex-originals/node_modules/mongodb/lib/operations/connect.js:375:5)
at /home/lol/Documents/node_dev/flex-originals/node_modules/mongodb/lib/operations/connect.js:442:14
at Server. (/home/lol/Documents/node_dev/flex-originals/node_modules/mongodb/lib/topologies/server.js:230:11)
at Object.onceWrapper (events.js:428:26)
at Server.emit (events.js:321:20)
at Server.EventEmitter.emit (domain.js:482:12)
at Pool. (/home/lol/Documents/node_dev/flex-originals/node_modules/mongodb/lib/core/topologies/server.js:436:21)
at Pool.emit (events.js:321:20)
[... lines matching original stack trace ...]
at /home/lol/Documents/node_dev/flex-originals/node_modules/mongodb/lib/core/connection/pool.js:994:11 {
name: 'MongoNetworkError',
[Symbol(mongoErrorContextSymbol)]: {}
}

DONE Compiled successfully in 28751ms 09:04:16

I Your application is running here http://localhost:undefined
`