article.cls

[William Hanson]

I'm a fairly new LyX user, and until recently I've been successful using 
version 1.6.3.  I've just updated to 1.6.6.1, but now I can no longer 
get Yap to generate the finished document.  I get an error message 
saying that the file 'article.cls' was not found.  What should I do? 


Bill Hanson