On Fri, 2011-12-09 at 20:26 +0100, Hans Hagen wrote:
> I only see
> 
> cont-en.fmt  : format file, sits in the cache and stays there
> cont-en.lui  : lua startup stub, idem
> 
> handbook.tex : your file, is kept where it is
> 
> Hans

Then I am not sure what file it is missing then since all of those files
exist. 

$ ls
-s /home/kip/.texmf-var/luatex-cache/context/e570cb3e0e3ab0118ca08dd148bbec7d/formats/cont-en.fmt /home/kip/.texmf-var/luatex-cache/context/e570cb3e0e3ab0118ca08dd148bbec7d/formats/cont-en.lui Source/Handbook.tex 
7868 /home/kip/.texmf-var/luatex-cache/context/e570cb3e0e3ab0118ca08dd148bbec7d/formats/cont-en.fmt

32 /home/kip/.texmf-var/luatex-cache/context/e570cb3e0e3ab0118ca08dd148bbec7d/formats/cont-en.lui
  32 Source/Handbook.tex

Here is the full console output:

$ luatex --file-line-error --interaction=batchmode
--fmt="/home/kip/.texmf-var/luatex-cache/context/e570cb3e0e3ab0118ca08dd148bbec7d/formats/cont-en.fmt" --lua="/home/kip/.texmf-var/luatex-cache/context/e570cb3e0e3ab0118ca08dd148bbec7d/formats/cont-en.lui" --backend="pdf" "Source/Handbook.tex"
This is LuaTeX, Version beta-0.71.0-2011112616 (rev 4358) 
 \write18 enabled.
This went wrong: cannot open : No such file or directory
system          > Handbook.top loaded

fonts           > latin modern fonts are not preloaded
languages       > language en is active
fonts           > preloading latin modern fonts (second stage)
fonts           > preloading latin modern fonts (third stage)

Clearly the message is ambiguous since I am not sure which file it is
referring to.

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