I'm using Amelia in R to impute missing values for my data, but I'm having a problem. When I include a bounds= argument, I get an error message as follows:

"Error in matrix(NA, nrow = AMn.ss, ncol = AMp) :
non-numeric matrix extent"

Here is what my code looks like:

imput.bound<-matrix(c(1,2,3,4,5,6,7,8,9,10, -50,-50,-50,-50,-50,-50,-50,-50,-50,-50, 20,20,20,20,20,20,20,20,20,20),
nrow = 10, ncol=3, byrow=FALSE,)

blod<-amelia(data=nonmiss, m=5, p2s=1, idvars="childid", bounds=imput.bound, max.resample=100)

Does anybody see what I'm doing wrong? I tried looking through the reference guide, "Amelia II: A Program for Missing Data", but I couldn't find any info on this particular error message. Any advice you could offer would really be appreciated.