R help - Mar 2010 - error while usig "tm" package

I have recently started using "tm" package by Feinerer, K. Hornik, and
D.
Meyer.
While trying to create a term-document matrix from a corpus (approxly 440
docs)
I get the following error:

tdm <- TermDocumentMatrix(tmp, control=list(weighting=weightTfIdf,
minDocFreq=2, minWordLength=3))
*Error in rowSums(m > 0) : 'x' must be an array of at least two
dimensions*

This error appears for option weighting=weightTfIdf and not for
weighting=weightTf
As Idf would need division by df, is this anything to do with nature of my
data?
May be I am doing something silly. Can any one please help?

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