'CertificateOptions' is not defined

While my code is trying to activate the Client with the following code:

client = Client(EndPoints.PROTOBUF_LIVE_HOST if self.endpoint == 'live' else EndPoints.PROTOBUF_DEMO_HOST, EndPoints.PROTOBUF_PORT, TcpProtocol)

The following error occurs while using the Python SDK:-

RuntimeError error: name 'CertificateOptions' is not defined

This appears to be emanating from ctrader_open_api.Client, is there additional things l need to do to avoid this error. Or is there a fix?

The code is running on Apple imac with Apple M1 processor, numpy 1.24.1 and protobuf 3.20.1. If anyone has come across this before, how you tackled it would assist me greatly.