Answers.Body: <p>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.</p>
  
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2023-07-31T15:35:08.790Z
Answers.LastActivityDate: 2023-07-31T15:35:08.790Z
Answers.UserDisplayName: Jme
Body: <p>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:</p>
  <p><a href="https://i.sstatic.net/jLtJr.png" rel="nofollow noreferrer"><img src="https://i.sstatic.net/jLtJr.png" alt="program code" /></a></p>
  <p>...........Updated.............</p>
  <p>Finally I solved it when I delete 2 define function and group in the program start. But I don't know why it work.
  <a href="https://i.sstatic.net/lyi8U.png" rel="nofollow noreferrer"><img src="https://i.sstatic.net/lyi8U.png" alt="work now" /></a></p>
  
Tags: <mindstorms><programming><robot-inventor>
Title: Mindstorms program error when I play in download mode
UserDisplayName: Cat Ho
ThreadText: # Mindstorms program error when I play in download mode
  
  (Asked by: username_0 on 2023-07-29)
  
  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](https://i.sstatic.net/jLtJr.png)](https://i.sstatic.net/jLtJr.png)
  
  ...........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](https://i.sstatic.net/lyi8U.png)](https://i.sstatic.net/lyi8U.png)
  
  **Tags:** mindstorms, programming, robot-inventor
  
  ---
  
  ## 1 answers
  
  ### Answer by username_1 on 2023-07-31. Score: 2
  
  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.
  
  
  ---
  
  