Sorry..I did not logged in and poste the message. It appeared as Anonym.
I logged in and here is the updated message.
think I figured out to have work around.
GAC is in assembly; restart of host has already been done.
Local testing of maps works fine and same code build from other systems also works fine. It seems that the issue on softwares installed in my machine.
I infact build the virtual PC with WIndows XP, .net 2003, Biztalk 2004, SQL Server 2000. After all these installation in Virtual PC, I build the code. Deployed into our staging environment and it works fine without any XLANG error.
Strange..I did not know the root cause but using virtual PC worked; Sometimes better to have workaround rather than finding the root cause.