Run time error C++ when using Ansoft Designer 6

Hi,
When I am trying to open the previous projects designed in Ansoft Designer 4 using Ansoft Designer 6. I am getting a Runtime error.

I am not able to open my previous designs using Designer 6. I searched in google for this error, but they say this error is seen only after installing XP.

I am attaching error details. Could you guys please help me with this issue?

Thanks,
sv.