Error upgrading VB6 project....

What does this message mean when trying to upgrade a VB6 project to VB.NET?

http://www.designworkz.com/images/error.jpg

Are you upgrading VB6 proj that contains SSTab control ?

If you mean, are there tabs in the project then yes.

Well , I've read that there are some components even from MS that can't be distributed but I'm not sure if this is one of them .
But why don't you use the .NET TabControl ? This way you make sure that your proj is made of pure .NET code and components .