CHIRP

Hi all
I have a issue when i want to load memory from a yaesu FT50R ( i'm under Linux Debian 10 with the last version of Chirp 20200718 )
This message appears : **
ERROR: -- Exception: --
ERROR: Traceback (most recent call last):
File "/home/jeff/Téléchargements/chirp-daily-20200718/chirp/ui/clone.py", line 256, in run
self.__radio.sync_in()
File "/home/jeff/Téléchargements/chirp-daily-20200718/chirp/drivers/yaesu_clone.py", line 245, in sync_in
self._mmap = _clone_in(self)
File "/home/jeff/Téléchargements/chirp-daily-20200718/chirp/drivers/yaesu_clone.py", line 110, in _clone_in
raise errors.RadioError("Failed to communicate with the radio: %s" % e)
RadioError: Failed to communicate with the radio: an integer is required

ERROR: ----------------

RadioError: Failed to communicate with the radio: Attempting to use a port that is not open

ERROR: Clone failed: Failed to communicate with the radio: an integer is required **

Do you know what happens ?

Thanks for help

Jeff