There are two ways to solve this problem.
Option 1:
Meteor looks for the environment variable ROOT_URL to determine the default application URL http://localhost:3000/. You can save the settings as is, but you will need to use the following credentials in your facebook application configuration:
site_url: http://localhost:3000/
Option 2 :
If you want to use the preview URL, you need to install site_urlfacebook application in its configuration:
site_url: http://machinename.usw1-2.nitrousbox.com
The next step is to launch Meteor with the following command:
$ ROOT_URL=http:
Alternatively, you can follow the Meteorite documentation to change your root URL.
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