R2WinBugs data import error

For some purpose, I  need to transfer a NAs array to WinBugs through
R2WinBugs, But I constantly got an error message:"'type' must be "real" for
this format". Here is my data to transfer:

x = matrix(data=NA,nrow=3,ncol=3)
x =  as.array(x)
data <- list ("x")

if I add a line to above setting, then I can pass R2WinBugs:

x[1,1] = 0

If I manually input the NA array to WinBugs, I could get it running. So my
original data set has no problem with WinBugs.

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