ssl.SSLError: Cannot create a client socket with a PROTOCOL_TLS_SERVER context

While creating a SMTP server in the TLS/SSL wrapper I get the following error:

Traceback (most recent call last):
File "C:\some_path\some_file.py", line 196, in test_ReceiverSetup_EventLog_Email_SSL
self.verify_smtp_client(hostname, port, 'SSL/TLS')
File "C:\some_path\some_file.py", line 156, in verify_smtp_client
self.server.start()
File "C:\some_path\venv\lib\site-packages\aiosmtpd\controller.py", line 223, in start
self._trigger_server()
File "C:\some_path\venv\lib\site-packages\aiosmtpd\controller.py", line 315, in _trigger_server
s = stk.enter_context(self.ssl_context.wrap_socket(s))
File "C:\Python310\lib\ssl.py", line 512, in wrap_socket
return self.sslsocket_class._create(
File "C:\Python310\lib\ssl.py", line 1061, in _create
self._sslobj = self._context._wrap_socket(
ssl.SSLError: Cannot create a client socket with a PROTOCOL_TLS_SERVER context (_ssl.c:801)