How can I find the source of warnings in *Compile-Log*?

[Eric Hanchrow]

I'm running CVS Emacs.  I've noticed that whenever I start it, it
shows me a buffer named *Compile-Log*, whose content is always

    Warning: `error' called with 1 args to fill 0 format field(s)
    Warning: `error' called with 1 args to fill 0 format field(s)
    Warning: `error' called with 1 args to fill 0 format field(s)
    Warning: `error' called with 1 args to fill 0 format field(s)

I can't figure out how to find out what's causing those warnings.
I've been ignoring them for ages, to no noticeable ill effect, but
they're starting to annoy me ... any ideas for tracking down their
cause?

-- 
The one thing that unites all human beings, regardless of age,
gender, religion, economic status or ethnic background, is that
deep down inside, we all believe that we are above average
drivers.
         -- Dave Barry