I have converted some ASP webpages to ASP.net using Migration Assistant.These pages has reference to some VB dlls and VC++ EXEs.The ASP.Net converted pages works well in my system without any problem.

but...in the testing machine,we rebuild the package of VB and VC++ and there i tried to run this ASP.NET pages.but it is giving 'COMException:Object variable or with block variable not set' error in the line where we create instance to the VB dlls.
Even i tried with tlbimp tool in that machine to create wrapper classes again in that machine.Still it is not working.
No problem with registering of VB and VC++ dlls.because another ASP application using the same dlls works fine.

any suggestions?thanks in advance.