As @Richard mentioned the error is : Could not find an option named "--web-renderer"
I have found the same problem mentioned in https://github.com/flutter/flutter/issues/163199
Try following solution from @Crucialjun
"Go to vscode settings and search for "flutterWebRenderer" set the value to flutter-default on both user and workspace"
if that does not work, try doing a further reading into https://github.com/flutter/flutter/issues/145954
The team made a breaking changes on that, and the discussion is still going