Hey enricogp, there is currently no way to fix it (that I know of) however that is very normal. It says that to let you know Mojang haven't released a version with that name so it can't update it, which is exactly what you want.
Actually FyberOptic, there is a easier way to fix it. Just go into the .json file and change the release date to a earlier date than the actual game in "releaseTime" and it should be fixed. Hope this helped