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1 : /// An exception thrown when subscribing to receive positions while another 2 : /// subscription is already active. 3 : class AlreadySubscribedException implements Exception { 4 : /// Constructs the [AlreadySubscribedException] 5 2 : const AlreadySubscribedException(); 6 : 7 1 : @override 8 : String toString() => 9 : 'The App is already listening to a stream of position updates. It is not ' 10 : 'possible to listen to more then one stream at the same time.'; 11 : }