I am experiencing error message below when I try OCR the PDF file

The steps are:

1. I upload a pdf file (my passport copy - 1 page) which has signature
2. I expect the pdf file should convert to TIFF file format and create OCR text however I get errors below

Any idea why such error occurred ?

FYI, other pdf files are OK however a pdf file which has signature is creating the problem so far I found from the testing.

Refer the attachments of error message and configuration settings

Thanks

Kumar