Did you call the 'Set Token' API from Social Graph module before calling 'Get Friendlist'?
Please check point 2 from 'Preparing app for Playblazer' from this link:
http://docs.playblazer.com/api/v1/getting-started.html

All the social graph platforms require authorization (which is provided in the form of an OAuth token) to be able to access their data.

After you create the user's profile on Playblazer (using the 'Create Profile' API call from the User Profile module), you need to submit the user's access token (in case of FB, the FB SDK provides the access token. Similarly, Google+ SDK provides the OAuth access token) to the Playblazer platform using the 'Set Token' API call.
The Playblazer platform uses this token as authorization token when communicating with FB/G+ servers.