Hi Amit,
It's throwing below error message for the PDF file.
Sorry, We are not able to open '../data/base-pdf/fuel-bill-sample-1.pdf' Make sure the file exists.
However the required file is already exist.
-rw-r--r-- 1 root root 61261 Dec 14 21:53 ../data/base-pdf/fuel-bill-sample-1.pdf
Let me know if any package needed to open the PDF file in the code.
Thanks,
Aman