Newbie build error - help me

I am doing my first build - following the notes in the docs. My failure notes - the stuff in red - "What went wrong ’ says Unable to start the daemon process - etc. might be caused by incorrect configuration of the daemon " - I have just followed the notes exactly - the last thing I typed was the bulid “ionic build android” and then it started chugging along - some notes, then a page of dots (…) , then unzipping … - thenBuild Failed with an exception. etc. etc.

Thanks in advance.