You can find one great answer here by Kreacher.
Hope it helps.
Quote:I should focus on the direct referrals.This is the right conclusion.
Quote:When you go on the Tasks page you see a list of task groups (tasks having a certain but same actions you must do).
You're seeing i.e. 5 available for a certain task, but when you enter you may get this confusing message you are asking about.
It means that those 5 tasks are not yet completed but are taken by other members.
You can come back later and check again, as sometimes for some reasons (user gave up or didn't qualify) you are allowed to start working.