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I can run the program perfectly in the streaming mode, but it will flash a red light in the download mode after getting 5 points. Below is my program code:

program code

...........Updated.............

Finally I solved it when I delete 2 define function and group in the program start. But I don't know why it work. work now

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I believe the problem is due to nested custom blocks. I tried designing a very modular program once, but it would not download at all, and I believe it's because there were too many nested blocks. However, I cannot confirm this as it seems LEGO has published little to no comprehensive information on it's software.

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