We have no idea, but Google might.
If you get a wierd error message, start by Googling it - you are unlikely to be the first:
unable to launch configured visual studio development server. invalid pointer - Google Search[
^]
Follow a few of those links, and see if you find any that fit the rest of your situation.
If you don't, contact Microsoft - their tech support is often annoying, but also can be very good.