invalid labels; length 2 should be 1 or 0

I had the same problem, but found this note in the MICE package documentation
(at http://cran.r-project.org/web/packages/mice/mice.pdf):
Added June 25, 2012: The currently implemented algorithm does not handle
predictors that are
speci?ed as ?xed effects (type=1). When using mice.impute.2l.norm(), the
current advice is to
specify all predictors as random effects (type=2).
Warning: The assumption of heterogeneous variances requires that in every
class at least one observation has a response in y.



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