I've heard others recommend  downloading the latest firmware so I  
suppose that's a good place to start.   If you are still seeing the   
problem, then I would isolate the problem block by removing sections  
of the program until you get the download to work.  ( don't save the  
file).   Once the block is isolated then replace it with a  new one.

That seems to work for my team although if there is a better solution,  
I'd sure like to hear it.

David


On Nov 2, 2008, at 6:03 PM, Karen McSweeney Contreras wrote:

> 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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