Running the backend

[joshleetufts]

I got the following error when running "npm start" from the backend directory on localhost:5000.

TypeError: Parameter "url" must be a string, not undefined
at Url.parse (url.js:87:11)
at Object.urlParse [as parse] (url.js:81:5)
at module.exports (/Users/JoshLeeTufts/jumbocode/PeopleMakingADifference/Backend/node_modules/mongodb/lib/url_parser.js:16:23)
at connect (/Users/JoshLeeTufts/jumbocode/PeopleMakingADifference/Backend/node_modules/mongodb/lib/mongo_client.js:486:16)
at Function.MongoClient.connect (/Users/JoshLeeTufts/jumbocode/PeopleMakingADifference/Backend/node_modules/mongodb/lib/mongo_client.js:250:3)
at /Users/JoshLeeTufts/jumbocode/PeopleMakingADifference/Backend/index.js:15:25
at Layer.handle [as handle_request] (/Users/JoshLeeTufts/jumbocode/PeopleMakingADifference/Backend/node_modules/express/lib/router/layer.js:95:5)
at next (/Users/JoshLeeTufts/jumbocode/PeopleMakingADifference/Backend/node_modules/express/lib/router/route.js:137:13)
at Route.dispatch (/Users/JoshLeeTufts/jumbocode/PeopleMakingADifference/Backend/node_modules/express/lib/router/route.js:112:3)
at Layer.handle [as handle_request] (/Users/JoshLeeTufts/jumbocode/PeopleMakingADifference/Backend/node_modules/express/lib/router/layer.js:95:5)