Visual Studio 2010 - The version of clr.dll in the target does not match the one mscordacwks.dll was built for

I have prepared new virtual machine for one project (WS 2008, SQL 2008, CRM 2011, VS 2010). I had to develop several plugins and I faced with issue - when I tried to debug plugin and attach to w3wp process I have got following error message - The version of clr.dll in the target does not match the one mscordacwks.dll was built for.



I googled and have found possible solution - Install SP1 for VS 2010. After installation and reboot of virtual machine I was able to attach to w3wp and debug plugins without any issue.