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? ______________________________________________________________ ______________________________________________________________ To UNSUBSCRIBE or CHANGE YOUR SUBSCRIPTION, please visit https://listserv.jmu.edu/archives/vadcfll-l.html and select "Join or leave the list". If you want to join the VADCFLL-ADMIN-L mailing list - to which FLL administrative announcements will be distributed - visit https://listserv.jmu.edu/archives/vadcfll-admin-l.html and select "Join or leave the list". ______________________________________________________________ To UNSUBSCRIBE or CHANGE YOUR SETTINGS, please visit https://listserv.jmu.edu/archives/vadcfll-l.html and select "Join or leave the list". If you want to join the VADCFLL-ADMIN-L mailing list - to which FLL administrative announcements will be distributed - visit https://listserv.jmu.edu/archives/vadcfll-admin-l.html and select "Join or leave the list".