Runtime error

I mixed a project on my desktop on 5.5.6 64bit.
Transferred it to my laptop.
When I tried to open it with 5.5.6 64 bit Nuendo crashes and gives a Runtime error.
When I tried to open it with 5.0.0 64 bit Nuendo crashes and gives a Runtime error.
When I tried to open it with 4.3.0 64 bit it works fine.

This will happen on any project.

Projects started on the laptop in N5.5.6 work fine on the laptop.

THoughts?

Dave