Popisovač pro objekty ActivityDelegate, ActivityAction a ActivityFunc musí tvořit odkaz na aktivitu, která již existuje ve stromu. Na aktivitu popisovače X delegáta s nadřazenou aktivitou Y již odkazuje objekt Z.
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English version
The Handler for an ActivityDelegate, ActivityAction, or ActivityFunc must not be a reference to an activity already existing in the tree. The Handler activity 'X' of a delegate parented by 'Y' is already referenced by 'Z'.