[R] fit.variogram sgeostat error

[Alexys Herleym Rodriguez Avellaneda]

Hi,

When i do the next line it work fine:

fit.spherical(var, 0, 2.6, 250, type='c', iterations=10,
tolerance=1e-06, echo=FALSE,  plot.it=T, weighted=TRUE, delta=0.1,
verbose=TRUE)

But, i use the next and send one error:

fit.variogram("spherical", var, nugget=0, sill=2.6, range=250,
plot.it=TRUE, iterations=0)

This is the error:
Error in fit.variogram("spherical", var, nugget = 0, sill = 2.6, range
= 250,  :
  unused argument(s) (nugget = 0, sill = 2.6, range = 250, plot.it =
TRUE, iterations = 0)

any suggest?

Alexys H