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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