Ifly 737 Cbe, Pilot2atc3, and P3dv4

Hello everyone,
We built a B738 cockpit.
https://737projectcom.wordpress.com/

The cockpit software used is Ifly737 cbe,p3dv4 and Pilot2atc 3.

We're having a problem with the flight plan generated by pilot2atc3.
Ifly737 cbe can't open the .pln file stored in fsplan. 
Do you know why?

Another question:
Could we send the .pln file to P3DV4 and then have it read by iflycbe?
If so, how?

Thanks for your help.
Pat.

Edited September 30, 2025Sep 30 by Pat737