Meteor - TypeError: Cannot call method 'config' of undefined

Following the instructions on the meteor.js tutorial site:

https://www.meteor.com/tutorials/blaze/adding-user-accounts

I ran into the following error:

TypeError: Cannot call method 'config' of undefined

 There was an import statement that I had to add to a main.js file

import '../imports/startup/accounts-config.js';

It turns out I had added the  import line into the wrong 'main.js' file.
There are 2 main.js files: One in the client folder and the other in the server folder.


Once I moved the import statement to the client version, the app started working again