Put aside the LoopUntilLive part for the moment, and just set up the
scheduler. Follow the setup for the ServerListener, and ignore the part about the application Module. This creates a live stream with a file source. Try playing back that stream, which is Stream1 in the example setup. You should see sample.mp4 (bigbuckbunny) looping. This is the stream you will start the live stream on in LoopUntil live. If you have the scheduler working and Stream1 playing, move on to the LoopUntilLive guide, and put "Stream1" as the value in loopUntilLiveOutputStreams.
What stream name are you playing when you do this? The way LoopUntilLive works you continue to play "Stream1". The when you start the live stream, which you should be able to play directly, it should also the stream you see when you play Stream1.
What is the source, the live stream that should interupt the loop? Is it an Live RTMP encoder, or a MediaCaster stream?
The scheduler and LoopUntilLive are working together.
Detail the setup and playback steps you are taking, and the details of the live stream. Can you play the live stream directly? So, for example, you start "myStream", which should interrupt the loop playing on Stream1, can you play myStream directly?