mydefs bailing out due to not liking @Ding

Writing a math paper using the report document type.  Lout has been so 
slick and easy up until now, when it started puzzling me with this error 
message:


bash> lout mathpaper.lt > a.ps
lout file "mydefs" (from "myreport" line 36, from "Fracar2011" line 3):
     3,12: symbol @Ding unknown or misspelt


after I wrote this simple mydefs file:


import @BasicSetup
def @op  { @Ding a66 }


This appeared after I copied and trivially modified the report setup 
file for this project, but I wouldn't blame that since I made several 
other changes at the same time, including moving sections into separate 
source files.   Perhaps the 'import' line in mydefs is not right for 
making @Ding meaningful?

-- 
Daren Scot Wilson
Escondido California
http://www.darenscotwilson.com