Echange setup error...

[packcrypto]

could someone walk mw trough this error message??? plz

<-- GET /api/imports
  --> GET /api/imports 200 4ms 2b
  <-- GET /api/gekkos
  --> GET /api/gekkos 200 1ms 24b
  <-- GET /api/apiKeys
  --> GET /api/apiKeys 200 0ms 2b
  <-- GET /api/exchanges
  xxx GET /api/exchanges 500 18ms -

  TypeError: _.last(...).join is not a function
      at exchangesDir.filter.f (/Users/ikeshpack/gekko/web/routes/exchanges.js:17:31)
      at Array.filter (<anonymous>)
      at Object.module.exports (/Users/ikeshpack/gekko/web/routes/exchanges.js:17:6)
      at module.exports.next (<anonymous>)
      at Object.dispatch (/Users/ikeshpack/gekko/node_modules/koa-router/lib/router.js:334:5)
      at dispatch.next (<anonymous>)
      at onFulfilled (/Users/ikeshpack/gekko/node_modules/co/index.js:65:19)