Can't instantiate abstract class ControllerApplication with abstract methods #3

I installed the requisite packages of 'ZigCoHTTP' on Ubuntu 20.04.6 LTS (linux kernel v5.15.x) system. The system has following python and pip versions:

• Python v3.8.10
• pip v20.0.2

When I run the 'ZigCoHTTP' app, it throws the following error:

Traceback (most recent call last):
File "main.py", line 12, in
zigbee_controller = ZigbeeController()
File "/home/sansys/src/XBee/ZigCoHTTP/zigbee_controller.py", line 15, in init
self.app = ControllerApplication(self.ezsp, os.getenv('DATABASE_FILE', "devices.db"))
TypeError: Can't instantiate abstract class ControllerApplication with abstract methods add_endpoint, connect, disconnect, load_network_info, permit_ncp, permit_with_link_key, reset_network_info, send_packet, start_network, write_network_info