In the wikis controller:

  index(req, res, next) {
    wikiQueries.getAllWikis((err, wikis) => {
      if (err) {
        console.error(err);
        res.redirect(500, "static/index");
      } else {
        res.render("wikis/index", { wikis });
      }
    });



/////////////////
ERROR
/////////////////
This is the output for the console.error....

2018-10-21T00:12:14.674400+00:00 app[web.1]: { SequelizeConnectionRefusedError: connect ECONNREFUSED 127.0.0.1:5432
2018-10-21T00:12:14.674413+00:00 app[web.1]:     at connection.connect.err (/app/node_modules/sequelize/lib/dialects/postgres/connection-manager.js:96:24)
2018-10-21T00:12:14.674416+00:00 app[web.1]:     at Connection.connectingErrorHandler (/app/node_modules/pg/lib/client.js:123:14)
2018-10-21T00:12:14.674418+00:00 app[web.1]:     at emitOne (events.js:116:13)
2018-10-21T00:12:14.674420+00:00 app[web.1]:     at Connection.emit (events.js:211:7)
2018-10-21T00:12:14.674422+00:00 app[web.1]:     at Socket.reportStreamError (/app/node_modules/pg/lib/connection.js:71:10)
2018-10-21T00:12:14.674423+00:00 app[web.1]:     at emitOne (events.js:116:13)
2018-10-21T00:12:14.674425+00:00 app[web.1]:     at Socket.emit (events.js:211:7)
2018-10-21T00:12:14.674427+00:00 app[web.1]:     at emitErrorNT (internal/streams/destroy.js:66:8)
2018-10-21T00:12:14.674429+00:00 app[web.1]:     at _combinedTickCallback (internal/process/next_tick.js:139:11)
2018-10-21T00:12:14.674431+00:00 app[web.1]:     at process._tickCallback (internal/process/next_tick.js:181:9)
2018-10-21T00:12:14.674432+00:00 app[web.1]:   name: 'SequelizeConnectionRefusedError',
2018-10-21T00:12:14.674435+00:00 app[web.1]:   parent:
2018-10-21T00:12:14.674437+00:00 app[web.1]:    { Error: connect ECONNREFUSED 127.0.0.1:5432
2018-10-21T00:12:14.674438+00:00 app[web.1]:     at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1191:14)
2018-10-21T00:12:14.674441+00:00 app[web.1]:      errno: 'ECONNREFUSED',
2018-10-21T00:12:14.674443+00:00 app[web.1]:      code: 'ECONNREFUSED',
2018-10-21T00:12:14.674444+00:00 app[web.1]:      syscall: 'connect',
2018-10-21T00:12:14.674446+00:00 app[web.1]:      address: '127.0.0.1',
2018-10-21T00:12:14.674447+00:00 app[web.1]:      port: 5432 },
2018-10-21T00:12:14.674449+00:00 app[web.1]:   original:
2018-10-21T00:12:14.674450+00:00 app[web.1]:    { Error: connect ECONNREFUSED 127.0.0.1:5432
2018-10-21T00:12:14.674452+00:00 app[web.1]:     at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1191:14)
2018-10-21T00:12:14.674453+00:00 app[web.1]:      errno: 'ECONNREFUSED',
2018-10-21T00:12:14.674455+00:00 app[web.1]:      code: 'ECONNREFUSED',
2018-10-21T00:12:14.674456+00:00 app[web.1]:      syscall: 'connect',
2018-10-21T00:12:14.674458+00:00 app[web.1]:      address: '127.0.0.1',
2018-10-21T00:12:14.674459+00:00 app[web.1]:      port: 5432 } }
2018-10-21T00:12:14.677736+00:00 app[web.1]: GET /wikis 500 6.914 ms - 84
2018-10-21T00:12:14.859228+00:00 app[web.1]: GET /favicon.ico 404 2.124 ms - 150