This week's book giveaways are in the Refactoring and Agile forums. We're giving away four copies each of Re-engineering Legacy Software and Docker in Action and have the authors on-line! See this thread and this one for details.
On the link you provide there's a list of supported tag. I don't see "radiomap" on it, although you didn't include a way to reproduce the problem, so I don't really know under what circumstances you get the error.
But my first guess would be that the supported tags include only those tags listed in the supported tags list.