Hey Hans et al.,

Using ConTeXt  ver: 2012.01.23 19:45 MKIV  fmt: 2012.1.24  int:
english/english and LuaTeX, Version beta-0.71.0-2012012215 (rev 4358), I
get the following error while typesetting my book:

! Undefined control sequence.
<argument> \doconvertedstructurecounter 
                                        [\v!formula ][]
\flushbothlabelclass #1#2#3->#1#3
                                 #2
<argument> ...spaces \doplacecurrentformulanumber 
                                                  \removeunwantedspaces
\dos...
\flushbothlabelclass #1#2#3->#1#3
                                 #2
\namedtaggedlabeltexts ...\dostarttagged {#1}{#2}}
                                                  \dostoptagged
\endgroup 
\placecurrentformulanumber ...moveunwantedspaces }
                                                  \formulaparameter \c!
right...
...
l.120 \stopformula
                  
? E
You want to edit file Source/Terms_and_Concepts/Terms_and_Concepts.tex
at line 120

The line it is referring to is the last line of the following code
snippet:

...
\placeformula[formula:Verhulst equation]
\startformula
\math{P(t) = \frac{K P_0 {\it e}^{rt}}
                  {K + P_0({\it e}^{r t} - 1)}}
\stopformula % Line 120
...

-- 
Kip Warner -- Software Engineer
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http://www.thevertigo.com