R help - Oct 2010 - Data conversion from class asc to class kasc (Adehabitat)

Hello list,
I am trying to do an Ecological Niche Factor Analysis using the adehabitat
package, but I am facing problems with preparing my covariates for input.
The covariates are of class "asc" and i need to get them to class
"kasc"
using the "as.kasc" function. But when I try to create the list, I get
an
error message
saying "all the objects should have the same attributes".

This is the code I am using to create the kasc object:
> covariates <- as.kasc(list(dem=import.asc("elevation.asc"),
slope=import.asc("slope.asc"),
slope.position=import.asc("slope_position.asc"),
+ water=import.asc("water_distance.asc"),
vegetation=import.asc("vegetation.asc")))

Please any help on this?

-- 
Neba, Funwi-Gabga
MSc student in Geosp. Tech.

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