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The most common reason for seeing this, is having purchased the version of the game entitled "Destiny: The Taken King", which is a collection of expansions only (does not include the base game), and not having purchased the base game itself. If this is your situation, the only solution is to obtain a copy of the base game. If you are in this situation, it is recommended to discuss any options with your console manufacturer. If you do not previously own any destiny content, the best package to purchase is Destiny the Collection. https://www.bungie.net/en/Help/Article/45114