I modify the system properties to display the file extensions and tick on (always show) but despite that, it still does not work, always the same thing, the DFR_Key.h.h. I'm exhausted,
I'll start all over again, do you have a library DFR_Key to advise me, maybe my library is not up to date? I use the DFR_Key V4 library. Thank you again for your support.