linux geph4-client does not work as it should

Executing following command shows geph4-client help output (command line does not get parsed correctly).

geph4-client connect --override-connect SERVERGENKEY@PUBLICIP:PORTNO --vpn-mode tun-route

does return the help page of the command as follows

geph4-client-connect 4.8.5

geph4-client connect [FLAGS] [OPTIONS]

What is wrong with the above command ? Why it does not get parsed correctly!!?