R help - Jul 2011 - invalid subscript type 'list'

Hello.

I'm using the RUF package for R and my input data come from a .csv file. I
get
this error: invalid subscript type 'list'.
Here is the script I'm using:

input<-read.csv("C:/..../summer03_regr.csv",header=T)
subset<-read.csv("C:/..../summer03_subset.csv",header=T)
ruf.fit(UD~veg+openness+elevation+slope+rivers+road1+road2+road3,space=~easting+northing,data=input,subset=subset,name="summer
 2003", standardized=FALSE)

Any suggestions on what could be causing the error?

Alessia Uboni
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