Sometimes, when you go to your Offer Wall and 'View Tasks' in the Freebies Island, you might not have any task available.
But why does this happen?
This all depends on the Providers. They show tasks based on, for example, the country you are in, account history, rewards amount, time of the year, etc.
This is why, sometimes, you might have no Tasks available.
BUT, stay tuned! The providers are constantly renewing and adding offer and new tasks!