I see it after start YSFReflector

ua6hjq@ua6hjq:/opt/pYSFReflector3$ sudo -u mmdvm ./YSFReflector pysfreflector.ini
Starting pYSFReflector-20240210
Traceback (most recent call last):
File "./YSFReflector", line 1523, in
RunServer(config)
File "./YSFReflector", line 933, in RunServer
printlog(4, 'Starting pYSFReflector-' + version)
File "./YSFReflector", line 1436, in printlog
str_log = check_string('M: ' + str(datetime.datetime.now(datetime.UTC).strftime('%Y-%m-%d %H:%M:%S.%f'))[:-3] + ' ' + mess)
AttributeError: module 'datetime' has no attribute 'UTC'
how can i fix this?
I use Debian 10 (buster)