[R] NPMC - replacement has 0 rows (multiple comparisons)

[Karmatose]

Hi folks, sorry if this has been answered before, I searched long and hard
before deciding to make a thread.

I'm trying to include multiple variables in a non-parametric analysis
(hah!). So far what I've managed to figure out is that the NPMC package from
CRAN MIGHT be able to do what I need, but I can't get it to.

First I created a dataset as NPMC calls for.

> Ind=Individual    | <- predictor
> D=Day              | <- predictor
> S=Sex               |   <- predictor
> hand = handlingtotal       | <- response
> occy.df<-data.frame(hand,Ind,D,S)

Then I checked the classes of each variable (factor, integer, factor,
numeric from top to bottom).

Ok, go!
> npmc(occy.ds)

But alas, I get this error:
Error in `$<-.data.frame`(`*tmp*`, "class", value = integer(0)) : 
  replacement has 0 rows, data has 48

I thought maybe this was a problem to do with Day being an integer (seeing
as it mentions integer in the error message), but no dice. Can any R-guru's
out there please share their wisdom and apply some magic to solving this
problem? The world of non-parametric analysis is somewhere I didn't
willingly blunder into, but now that I'm here I'm in over my head, and any
help you can throw my way would be super super appreciated.

Kind regards,
Dean.
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