VB6 Win app using CR XI R2 crashes while generating many PDFs

Hi,

We use a Windows application built using VB6,CR XI R2. It creates a report that generates PDF docs from CR files.This is working for less number of files.But when used for more number of files,following errors are generated

1.In user machines(Win 7, XP),app crashes while generating the report without throwing the error.

2.In DEV machine(XP),process stops saying there is no free resources available to perform the operation.

My code is like the below-

1.A loop that generates the ID

2.For the first item,CR generates a report with data for that ID

3.Report data is exported into a PDF document and saved to a File path

4.Move to the Next ID and this loop goes on.

I tried updating the CR version from CR XI R2 without SPs by updating SP4 and SP6,but none of this works.

Please help in resolving this issue.