Error on start: Bad Twitter streaming request: 401

[Krigsa]

Hi, once I've built correctly (I think) and I try to start while my MongoDB is running, i got this error:
[DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.
events.js:174
throw er; // Unhandled 'error' event
^

Error: Bad Twitter streaming request: 401
at Object.exports.makeTwitError (C:\Users\Pab\twitter-sentiment-visualisation-dev\node_modules\twit\lib\helpers.js:74:13)
at Request. (C:\Users\Pab\twitter-sentiment-visualisation-dev\node_modules\twit\lib\streaming-api-connection.js:96:29)
at Request.emit (events.js:194:15)
at Gunzip. (C:\Users\Pab\twitter-sentiment-visualisation-dev\node_modules\request\request.js:1083:12)
at Object.onceWrapper (events.js:277:13)
at Gunzip.emit (events.js:194:15)
at endReadableNT (_stream_readable.js:1103:12)
at process._tickCallback (internal/process/next_tick.js:63:19)
Emitted 'error' event at:
at Request. (C:\Users\Pab\twitter-sentiment-visualisation-dev\node_modules\twit\lib\streaming-api-connection.js:99:14)
at Request.emit (events.js:194:15)
[... lines matching original stack trace ...]
at process._tickCallback (internal/process/next_tick.js:63:19)
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! twitter-sentiment-visualisation@1.5.0 start: node ./bin/www
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the twitter-sentiment-visualisation@1.5.0 start script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR! C:\Users\Pab\AppData\Roaming\npm-cache_logs\2019-03-06T17_38_49_290Z-debug.log

I'm guessing it is from an autorisation issue but I'm not sure neither where it occurs precisly (though I think it comes from the www file) nor how to fix it.
Thanks in advance!