X-Plane 11 not working after copying new data from Navigraph

Hi. I had to reinstall XPlane 11 (11.55r2) on my Mac. I then pasted the last, up-to-date nav data from Navigraph (version for XPlane 11.5…) in the Custom Data folder, as usual,
but when I tried to start the simulator I had a warning message:

“No Procedures found in ‘CIFP’ folder. Please check the CIFP folder for case-sensitivity. If the folder does not contain uppercase files with lowercase extensions, report this problem your Navdata provider.” When I click “OK” XPlane closes.

The CIFP folder seems to be normal (uppercase files with lowercase extensions). I tried and retried, without any results.
Can you help me please?

Stefano Salis
Milan, Italy