npm run main fails.

[gbasiemseverest]

Thank you for sharing the amazing piece of your work,

I followed your well explained steps to reach here, but i couldn't npm run main to the backend.
I am continuously receiving the error,

TypeError: Cannot read property 'legs' of undefined

As suggested by few fellow programmers, i upgraded the npm version to 6.2 but still couldn't get any solution then i even downgraded to the version 4.6.1 still i am not getting anywhere.
Any help will be highly appreciated. Thank You

[monikagupta78]

I am also getting same error, were you able to fix this?

[domesticmouse]

legs is supposed to be an attribute of the returned data, the fact that it is absent is indicative of there being no routes available. I should really add some error handling.

[monikagupta78]

@domesticmouse - does it mean we are good with backend setup? How to confirm the same?

[domesticmouse]

Have you gone through the transport tracker codelabs?

[hynra]

const ptt = this.directionsResponseForTrip(returnValue.next_trip.trip);

I faced same issue. If you print ptt, it's return message This API project is not authorized to use this API. I've resolved this issue by changing Maps API key in tracker_configuration.js from API Key to Server Key. I realized that The Getting Started (https://developers.google.com/maps/solutions/transport-tracker/start) is guide me to copy the API Key instead of Server Key.

[humbertn]

Hi @hynra where can I get the "Server Key" that you mention, thanks for you answer.

[Maphila]

@hynra The Server Key (from firebase) is giving out errors?

[mrsvt]

The project uses Directions API. Enable the API, then it will work.

transport-tracker/backend/time_table.js

Lines 205 to 206 in 0146b3e

	this.googleMapsClient
	.directions(request)

Server Key is just a credential name generated by Google Service. For testing purposes, just ensure that the used API key doesn't have restrictions.