VB.Net – debug info problem

Hi All!
I have a problem and will be glad if anybody can help me.
The problem is that I can’t load symbols for my project in VB.NET. I have a solution from several projects (class libraries), and VB6 client exe using them. In VB.NET environment I set executable to VB.6 client exe and try to debug my library code, but can’t sety breakpoints or trace code becouse of debuger can’t load symbols info for that library. I done full rebuild, delete all .NET.dll and pdb files, but it didn’t correct this problem.
Can anybody help me?

Best regards,
Gladkov Sergey.