Trying to copy a theme

Please advise if this is not the kind of post you had intended for this new 
list.

To try to understand how themes work in Xaraya, I did the following:

1) copied /themes/Xaraya_Classic to my test directory, /themes/Cruciverb
2) entered /themes/Cruciverb, edited xartheme.php, edited all pages in 
/pages, changing instances of Xaraya_Classic to Cruciverb
3) went to Admn menu, chose themes, did a Regenerate Themes
4) Initialised and Actiivated the Cruciverb theme
5) Changed the site's default theme to Cruciverb

Now when I visit the site I get:


(USER Exception) InvalidSpecialVariable:

Template error in file themes/Cruciverb/pages/default.xt at line 7, column 
31: Invalid use of 'tpl:pageTitle' special variable.
         <title>#$tpl:pageTitle#


So why does #$tpl:pageTitle# get set when using Xaraya_Classic but not 
Cruciverb? What step am I missing?

Thanks,

- Kevin