R help - Mar 2007 - Trouble figuring messages from rcspline.plot

I have an attached data.frame with a binary composite variable (comp) 
and a predictor (egfr).  I am trying to plot a restricted cubic spline using:


require (Hmisc)
require (Design)

rcspline.plot(x=egfr,y=comp,model="logistic",nk=5,knots=NULL,
               xlab="label1", ylab="Label2",
               plim=c(0,1), plotcl=TRUE,
               showknots=TRUE, add=FALSE, lty=1, noprint=FALSE, smooth=FALSE,
               main="Title goes here ");

I get the following error message (exactly as cut/pated):

Loading required package: package
Error in requirePackage("Design") : This function requires
theDesignpackage
In addition: Warning message:
there is no package called 'package' in: library(package, lib.loc = 
lib.loc, character.only = TRUE, logical = TRUE,

Should I be using an additional package?

Any suggestions will be appreciated.  Thanks,

Gerard Smits

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