Unable to Start Urbackup Client

Unable to start urbackup client we are getting below error, can you please help to fix this issue

2023-06-16 13:21:54: ERROR: urbackupserver: Failed binding ipv6 socket to port 35623. Another instance of this application may already be active and bound to this port.
2023-06-16 13:21:55: ERROR: Internet server not configured. Please configure “internet_server”.