I have had two problems downloading to the robot.
The first was fixed by going to legoengineering.com and installing the patch found there.
The second I discovered was a missing wire in the program that robolab somehow missed and showed the run button as good, instead of a broken arrow. After fixing the break it worked fine. in neither case was there any error message.

Greg
  ----- Original Message ----- 
  From: Karen McSweeney Contreras 
  To: [log in to unmask] 
  Sent: Sunday, November 02, 2008 6:03 PM
  Subject: [VADCFLL-L] NXT Robot error # 5021


  We are suddenly having trouble with our robot accepting downloads from our laptop computer.  We get an error message on the laptop computer that says "There is a data wire that does not have a data source.  Error # 5021."  But there do not appear to be any wires that are not connected!!  We tried connecting a different NXT robot to the laptop and we get the same problem; so we know it is the program, not the robot.  We deleted the program and reloaded it.  Nothing has helped. 

  Any thoughts on a solution or where I can find a solution?

   

   

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