[R] spatial correlogram

[tara]

Hello 
I am trying to use the correlog function to estimate a spatial correlogram
for the residuals of a logistic regression and I have run accross the
following error. 
 
> summary(binom1 <- glm(Use~X20mslop+X20mdem+soilsst, family=binomial,
+ data=M60m2000NE_1.df))

> correlog1.1 <- correlog(M60m2000NE_1.df$X, M60m2000NE_1.df$Y,
> residuals(binom1),w=NULL,
+ na.rm=T, increment=1, resamp=0)

Error in split.default(moran, dkl) : 
  Group length is 0 but data length > 0

Can anyone help me to understand what this error is referring to and suggest
how I can fix it? 
Thanks 
Tara

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