This error was getting me mad when I started programming the board, until I learned that at every flash cycle, I must to desconnect the board OSBDM port, wait a few seconds and reconnect it.
But today the trick did not work anymore: after five or six cycles where once and again CW's Flash Programmer reported this condition ( also after a Windows reboot ), I'm giving up and asking you, friends, what's going. Or at least, a good recipe to circunvent this class of annoying things.
Ah, of course, when the error displays, the "Details" button shows a dash line. Very helper data.