I have came through a  problem that i forget that i have install silverlight chainer and start installing it again. then during the installation i opened the control panel to check i have previously installed silverlight chainer or not, i found that it has already been installed so i canceled the progressing silverlight chainer installation. then i started visual studio 2008 and opened the current projects of silverlight and "The project type is not supprted by this installation " error message is given by visual studio. if i am creating a new silverlight application then "Object reference not set to an instance of an object" error occured.  Please help me to solve this problem.

Hi Zeeshan86,

You're not the only person having these problems, read this thread, the second post has a link to a very good blog which may be able to help you...

http://silverlight.net/forums/p/17677/59164.aspx#59164

saying that it didnt work for me and i ended up reinstalling my OS and starting from scratch

 But like i said check out that blog, it describes a few errors and has good detailed instructions on fixing them

The project type not supported error is usally resovled by running devenv /resetskippkgs

Hope this helps,
Brad

 plz give me the full path to write devnev/resetskippkgs

Open a command prompt and run this: 

 "C:\Program Files\Microsoft Visual Studio 9.0\Common7\IDE\devenv.exe" /resetskippkgs

The path could be different depending on where you installed VS.

Hope this helps,
Brad

I ran the devenv /resetskippkgs and it fixed the problem I was having with VS2008 (no SP1 beta) trying to open Silverlight 2 Beta 2 projects.

NOTE: I had previously tried the Silverlight_Tool_Fixup.zip vbs script located at http://weblogs.asp.net/bradleyb/archive/2008/06/18/fixing-setup-errors-installing-silverlight-tools-beta-2.aspx, and then reinstalled Silverlight 2 Beta 2.  When this didn't work I read about the /resetskippkgs flag, ran it, and now I'm back in the world of Silverlight goodness.

Very happy! Thanks.