Can not open web odm

Hyper-V Requirements: VM Monitor Mode Extensions: Yes
Detected OS with VirtualBox support
Initializing console…
Checking for OpenSSH Client at C:\WINDOWS\system32\OpenSSH\ssh.exe
OpenSSH check passed
‘docker-machine’ is not recognized as an internal or external command,
operable program or batch file.
No default docker-machine, good!
‘docker-machine’ is not recognized as an internal or external command,
operable program or batch file.
Docker is not communicating properly. We’ll attempt to establish communication…
‘docker-machine’ is not recognized as an internal or external command,
operable program or batch file.
WebODM VM does not exist. We’re going to create it now… hang on tight! If this takes more than 10 minutes, please try restarting your computer.
create --virtualbox-no-vtx-check --driver virtualbox --virtualbox-disk-size “150000” --virtualbox-memory “9156” --virtualbox-cpu-count “4” webodm
Uh oh! Check the console. Check that you have enough memory available, disk space, that your firewall is off and that you have restarted your computer. Refer to the troubleshooting section of the installation manual for more information.
‘docker-machine’ is not recognized as an internal or external command,
operable program or batch file.

what could be the problem. I am not so techy about this.