scanner not working 

i have installed cookiescanner and  CookieScanner --help gives correct output but when i try to scan website for cookies like this command 
 CookieScanner cli --headless --html cql.html covenantsql.io
returns 

 CookieScanner: error: start debugger failed: Get "http://localhost:9222/json/list": dial tcp [::1]:9222: connect: connection refused, try --help
