Why I get SD (7): Error opening file

[puneetvrma]

What version of pyhdf, HDF4, and Python are you using?

pyhdf version: 0.10.5
HDF4 C library version: 4.2.15
Python version: 3.9.12

What operating system are you using?

Windows 10 x64

What did you do?

I am using pyhdf code from this example.
http://hdfeos.org/zoo/MORE/LAADS/MOD/MOD04_L2_merge.py

However, it is giving me an error SD (7): Error opening file

The code works fine if I keep single file or a few files (less than 10) in the folder.

What did you expect to see?

What did you see instead?