Concatenate pdf files - Thread abortion occured. Please help

I was running asynchronous process for concatenating pdf files

I have about 30 pdf files each about 1 mb.

Files are like this: For testing - Actually these are the same files but I replicated and renamed.

a1.pdf

a2.pdf

a3.pdf

a4.pdf

------

-------

a30.pdf

At the middle of the concatenate process the "Thread abortion " occured. How can we solve this problem?

Hi Rob,

Can you please share a small sample application along with the problematic PDF file, so we would be able to test and reproduce the issue at our end? You’ll be updated accordingly.

We’re sorry for the inconvenience.
Regards,