UnhandledPromiseRejectionWarning: MongoError: not authorized on test to execute command...What the smoke?

We've been asked to download a project and be ready to comment intelligently in a meeting tomorrow, so I'm trying to get this app up and running on my local box, but I'm running into errors that I've not encountered before.

Here is the error as it appears on my terminal:

Listening on PORT: 3000
(node:3316) UnhandledPromiseRejectionWarning: MongoError: not authorized on test to execute command { insert: "system.indexes", documents: [ { ns: "test.user_sess
ions", key: { expires: 1 }, name: "expires_1", expireAfterSeconds: 0, unique: false } ], ordered: true, writeConcern: { w: "majority" }, lsid: { id: UUID("9674b2b
b-4da6-401a-9d90-7b0f35ace911") }, readConcern: { afterClusterTime: Timestamp(1579010568, 1) }, $clusterTime: { clusterTime: Timestamp(1579010568, 1), signature:
{ hash: BinData(0, 2F281F7B9881E802501648F77CC4113E4B119167), keyId: 6749132984986632193 } }, $db: "test" }
    at Connection.<anonymous> (C:\wamp64\www\bsmart\PRAMS\node_modules\mongoose\node_modules\mongodb-core\lib\connection\pool.js:443:61)
    at Connection.emit (events.js:210:5)
    at processMessage (C:\wamp64\www\bsmart\PRAMS\node_modules\mongoose\node_modules\mongodb-core\lib\connection\connection.js:364:10)
    at TLSSocket.<anonymous> (C:\wamp64\www\bsmart\PRAMS\node_modules\mongoose\node_modules\mongodb-core\lib\connection\connection.js:533:15)
    at TLSSocket.emit (events.js:210:5)
    at addChunk (_stream_readable.js:309:12)
    at readableAddChunk (_stream_readable.js:290:11)
    at TLSSocket.Readable.push (_stream_readable.js:224:10)
    at TLSWrap.onStreamRead (internal/stream_base_commons.js:182:23)
(node:3316) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch bl
ock, or by rejecting a promise which was not handled with .catch(). (rejection id: 1)
(node:3316) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the N
ode.js process with a non-zero exit code.

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Here's the error as it appears on my web browser:

Error: secret option required for sessions
    at session (C:\wamp64\www\bsmart\PRAMS\node_modules\express-session\index.js:200:12)
    at Layer.handle [as handle_request] (C:\wamp64\www\bsmart\PRAMS\node_modules\express\lib\router\layer.js:95:5)
    at trim_prefix (C:\wamp64\www\bsmart\PRAMS\node_modules\express\lib\router\index.js:317:13)
    at C:\wamp64\www\bsmart\PRAMS\node_modules\express\lib\router\index.js:284:7
    at Function.process_params (C:\wamp64\www\bsmart\PRAMS\node_modules\express\lib\router\index.js:335:12)
    at next (C:\wamp64\www\bsmart\PRAMS\node_modules\express\lib\router\index.js:275:10)
    at expressInit (C:\wamp64\www\bsmart\PRAMS\node_modules\express\lib\middleware\init.js:40:5)
    at Layer.handle [as handle_request] (C:\wamp64\www\bsmart\PRAMS\node_modules\express\lib\router\layer.js:95:5)
    at trim_prefix (C:\wamp64\www\bsmart\PRAMS\node_modules\express\lib\router\index.js:317:13)
    at C:\wamp64\www\bsmart\PRAMS\node_modules\express\lib\router\index.js:284:7
    at Function.process_params (C:\wamp64\www\bsmart\PRAMS\node_modules\express\lib\router\index.js:335:12)
    at next (C:\wamp64\www\bsmart\PRAMS\node_modules\express\lib\router\index.js:275:10)
    at query (C:\wamp64\www\bsmart\PRAMS\node_modules\express\lib\middleware\query.js:45:5)
    at Layer.handle [as handle_request] (C:\wamp64\www\bsmart\PRAMS\node_modules\express\lib\router\layer.js:95:5)
    at trim_prefix (C:\wamp64\www\bsmart\PRAMS\node_modules\express\lib\router\index.js:317:13)
    at C:\wamp64\www\bsmart\PRAMS\node_modules\express\lib\router\index.js:284:7
    at Function.process_params (C:\wamp64\www\bsmart\PRAMS\node_modules\express\lib\router\index.js:335:12)
    at next (C:\wamp64\www\bsmart\PRAMS\node_modules\express\lib\router\index.js:275:10)
    at Function.handle (C:\wamp64\www\bsmart\PRAMS\node_modules\express\lib\router\index.js:174:3)
    at Function.handle (C:\wamp64\www\bsmart\PRAMS\node_modules\express\lib\application.js:174:10)
    at Server.app (C:\wamp64\www\bsmart\PRAMS\node_modules\express\lib\express.js:39:9)
    at Server.<anonymous> (C:\wamp64\www\bsmart\PRAMS\node_modules\engine.io\lib\server.js:470:22)

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What does all of this mean and how can I fix it?

Thanks!