Function storing error messages in 32 bit R-2.15.2 version

I am using 32 bit R - 2.15.2 version and working on package ltm. The
program does not give me any warning message when I run tpm command for a
dataset. If run tpm command for the same dataset in 64-bit R 2.15.1
version, I get the warning message shown below.

Can someone suggest why is no warning message being generated by 32-bit R?
Or is it being generated but not getting printed? Which function will have
this warning message stored?

*Consider the following code that I ran on 64-bit R - *

This is package 'ltm' version '0.9-7'

resp<-read.table("D:\\DriveE\\IRT\\Outfiles\\testFile.txt")
params<-tpm(resp)

Warning message:
*In tpm(resp) :*
*  Hessian matrix at convergence contains infinite or missing values;
unstable solution.*

*Consider the following code that I ran on 32-bit R - *

resp<-read.table("D:\\DriveE\\IRT\\Outfiles\\testFile.txt")
params<-tpm(resp)
warnings()

NULL

Thanks and regards,
Maulik Shah

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