MongoServerError: command listDatabases requires authentication - mongodb

Question

please help
I've been on this issue for hours now and I really don't know what else to do (and all the research I did didn't provide any solution unfortunately). So I'm asking if anyone can think of an answer why this is not working:
mongodb.conf to
security:
authorization:
enabled
mongo-express work fine
mongodb.conf to
security:
authorization:
enabled
mongo-express not work...
config.js
'use strict';
var url = require('url');
if (typeof process.env.MONGODB_PORT === 'string') {
var mongoConnection = url.parse(process.env.MONGODB_PORT);
process.env.ME_CONFIG_MONGODB_SERVER = mongoConnection.hostname;
process.env.ME_CONFIG_MONGODB_PORT = mongoConnection.port;
}
module.exports = {
mongodb: {
server: process.env.ME_CONFIG_MONGODB_SERVER || 'localhost',
port: process.env.ME_CONFIG_MONGODB_PORT || 27017,
//autoReconnect: automatically reconnect if connection is lost
autoReconnect: true,
//poolSize: size of connection pool (number of connections to use)
poolSize: 4,
//set admin to true if you want to turn on admin features
//if admin is true, the auth list below will be ignored
//if admin is true, you will need to enter an admin username/password below (if it is needed)
admin: true,
// >>>> If you are using regular accounts, fill out auth details in the section below
// >>>> If you have admin auth, leave this section empty and skip to the next section
auth: [
{
database: 'admin',
username: 'admin',
password: 'adminpass'
}
],
// >>>> If you are using an admin mongodb account, or no admin account exists, fill out section below
// >>>> Using an admin account allows you to view and edit all databases, and view stats
//leave username and password empty if no admin account exists
adminUsername: process.env.ME_CONFIG_MONGODB_ADMINUSERNAME || 'admin',
adminPassword: process.env.ME_CONFIG_MONGODB_ADMINPASSWORD || 'adminpass',
//whitelist: hide all databases except the ones in this list (empty list for no whitelist)
whitelist: [],
//blacklist: hide databases listed in the blacklist (empty list for no blacklist)
blacklist: []
},
site: {
host: '0.0.0.0',
port: 8081,
cookieSecret: process.env.ME_CONFIG_SITE_COOKIESECRET || 'cookiesecret',
sessionSecret: process.env.ME_CONFIG_SITE_SESSIONSECRET || 'sessionsecret',
cookieKeyName: 'mongo-express',
sslEnabled: process.env.ME_CONFIG_SITE_SSL_ENABLED || false,
sslCert: process.env.ME_CONFIG_SITE_SSL_CRT_PATH || '',
sslKey: process.env.ME_CONFIG_SITE_SSL_KEY_PATH || ''
},
//set useBasicAuth to true if you want to authehticate mongo-express loggins
//if admin is false, the basicAuthInfo list below will be ignored
//this will be true unless ME_CONFIG_BASICAUTH_USERNAME is set and is the empty string
useBasicAuth: process.env.ME_CONFIG_BASICAUTH_USERNAME !== '',
basicAuth: {
username: process.env.ME_CONFIG_BASICAUTH_USERNAME || 'admin',
password: process.env.ME_CONFIG_BASICAUTH_PASSWORD || 'adminpass'
},
options: {
//documentsPerPage: how many documents you want to see at once in collection view
documentsPerPage: 10,
//editorTheme: Name of the theme you want to use for displaying documents
//See http://codemirror.net/demo/theme.html for all examples
editorTheme: process.env.ME_CONFIG_OPTIONS_EDITORTHEME || 'rubyblue',
//The options below aren't being used yet
//cmdType: the type of command line you want mongo express to run
//values: eval, subprocess
// eval - uses db.eval. commands block, so only use this if you have to
// subprocess - spawns a mongo command line as a subprocess and pipes output to mongo express
cmdType: 'eval',
//subprocessTimeout: number of seconds of non-interaction before a subprocess is shut down
subprocessTimeout: 300,
//readOnly: if readOnly is true, components of writing are not visible.
readOnly: false
},
// Specify the default keyname that should be picked from a document to display in collections list.
// Keynames can be specified for every database and collection.
// If no keyname is specified, it defalts to '_id', which is a mandatory feild.
// For Example :
// defaultKeyNames{
// "world_db":{ //Database Name
// "continent":"cont_name", // collection:feild
// "country":"country_name",
// "city":"name"
// }
// }
defaultKeyNames: {
}
};
please help.... please help