emulator for wp7.1 shows internal error

I've just started developing for windows phone 7 but can't seem to get my emulator working. I get an pop-up "Internal Error" and as a description in the bottom view i see "Error! Connection failed because of invalid command-line arguments".

I am running windows 8 developer preview (not in a virtual m开发者_C百科achine) on a mac mini(2gb ram, core2Duo 2,26Ghz). I've reinstalled the tools and have restarted the computer several times but nothing works. I am running VS as an administrator

Still there is a work around. Try installing an update WPSDK-7.1.1-KB2669191-x86. and it all works perfectly.

The Windows Phone 7 SDK does not support Windows 8.

You can see the system requirements (including supported operating systems) at http://www.microsoft.com/download/en/details.aspx?displaylang=en&id=27570