R help - Oct 2007 - "xlab" and "ylab" in clusplot

Hi there,

How can I change the "xlab" and "ylab" in clusplot instead
of
"Component 1" and "Component 2"? It always gives me the
following
error message.
Error in plot.default(x1[, 1], x1[, 2], xlim = xlim, ylim = ylim,  
xlab = "Component 1",  :
         formal argument "ylab" matched by multiple actual arguments

Thanks in advance.

Haiyong