arachni_web cannot get a successful running
I download the package from 'https://www.arachni-scanner.com/download', then run 'arachni_web' in conmmand line,but i cannot get a successful running。is there anything else i need to install?

I download the package from 'https://www.arachni-scanner.com/download', then run 'arachni_web' in conmmand line,but i cannot get a successful running。is there anything else i need to install?