[R] memory problem

[avsha38]

Hi,
when i run the following code i get this massege:

"The instruction at 0x######## reference memory at 

0x#######, the memory cannot be "read". 
and then i have to close R.

what is the problem and how can i solve it?

thanks in advance
Avi

my code

# frailtypack
library(frailtypack)
cgd.ag <- read.csv("C:/rfiles/RE/cgd.csv")
cgd.nfm <-frailtyPenal(Surv(TStart, TStop,
Status)~cluster(Center)+subcluster(ID)                 
         Treatment,data=cgd.ag,Frailty=TRUE,n.knots=8,kappa1=50000, 
           cross.validation=TRUE,recurrentAG=TRUE)

          
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