Errors when saving output from WinBUGS to R

Dear all

I used R2WinBUGS package's bugs() function to generate MCMC results. Then I
tried to save the simulation draws in R, using read.bugs() function. Here is
a simple test:
######################
library(coda)
library(R2WinBUGS)
#fake some data to test
beta0=1
beta1=1.5
beta2=-1
beta3=2
N=200
x1=rnorm(N, mean=0,sd=1)
x2=rnorm(N, mean=0,sd=1)
x3=rnorm(N, mean=0,sd=1)
lambda2= exp(beta0+ beta1*x1+ beta2 * x2 + beta3 * x3)
y=rep(NA,N)
for (i in 1: N) {
y[i]=rpois(1,lambda2[i])
}
#generate inputs required by winbugs
data <- list(Y20=y,x1=x1, x2=x2, x3=x3, N=N)
inits<- function(){
list(beta0=0, beta1=0, beta2=0, beta3=0)}
parameters <- c("beta0", "beta1", "beta2", "beta3")
#call winbugs using bugs() function
model <- bugs(data, inits, parameters,
model.file="C:/Jinmodel/test_codes/model_poisson.txt", n.chains=1,
n.iter=30, n.burnin=0,n.thin=1, codaPkg=TRUE, DIC=TRUE, debug=TRUE,
bugs.directory="C:/Users/Yiyi/Desktop/winbugs14/WinBUGS14") 
###########################################

I can get pretty good traceplots & parameter estimate outputs in WinBUGS.
However, when I switched back to the R Console (by pressing ESC key), a
warning message occurred:  
Warning message:
running command '"C:/Users/Yiyi/Desktop/winbugs14/WinBUGS14/WinBUGS14.exe"
/par "C:/Users/Yiyi/AppData/Local/Temp/Rtmpgdvr4Z/script.txt"' had status 93 

I ignored this message  & typed in the following code to save the outputs
into R:
################### 
myres <- read.bugs(model)
 ####################
An error message occurred: Error in is.vector(X) : object 'model' not found

I've been trying to solve this mystery for several weeks but couldn't make
any breakthough. 

Any suggestions are highly appreciated!

Best,

Yiyi

p.s. 0) the program is running in a Windows 7 Home Premium, 64-bit operating
system machine. 
             R version:   2.13.2, WinBUGS 14
       1) some old posts suggest running the software as the administrator
(to kill the warning message). Can anyone shed more light on how to log in
as the administrator? I am the sole user of my own laptop, not using the
pc's at my office.  So I doubt administrator is the issue.
       2) The second time I run the bugs() function, no warning message of
status 93 emerged.
       3) perhaps the warning message & the error message are somehow
related??

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