xenconsole: Could not read tty from store: No such file or directory

Alternate title:  Chris is smart.

So, upon opening my e-mail this evening (I'm still a little shell-shocked from dayjob pager last week, so I'm getting a late start of it.)    I see a support question from a customer who complained of the above error.  I see nothing obvious;  Chris looks at it and immediately notices that xenconsoled is not running.    as root:

/usr/sbin/xenconsoled

problem solved.