ERROR: Wrong type (expecting pair): ()

[Shevek]

I've recently started getting "ERROR: Wrong type (expecting pair): ()" when I
compile the code for a rather large (5000+ lines) project, and I have no
idea how to fix it. There is no line reference, and no indication what
causes this problem. Google searches seem to indicate that it is a very
generic Scheme error, which is no help at all. Is there any way I can
identify the problem, or at least narrow down what might be causing it?
Interestingly, the layout score block is compiling fine, it's just the midi
score block that is throwing the error (I have separate \score's for midi
and layout).
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