I load TOP friend list for the user whenever he loads the application, but for some reason I sometimes get errors for some users:

{responseItems_={friends={originalDataRequest_=[object Object], data_=null, errorCode_=unauthorized, errorMessage_=Unauthorized}}

and even this

{responseItems_={friends={originalDataRequest_=[object Object], data_=null, errorCode_=internalError, errorMessage_=An Internal Server exception has occurred. Please contact MySpace REST API Team.}}, globalError_=true, errorMessage_=undefined}

It's just a basic people request with TOP_FRIENDS filter copied from here.
So when application loads I fetch viewer and in its callback viewer friends.