PDB conversion error

Hello,

I am not a prolific e-book reader, preferring paper where possible. But I like to carry a few books on my phone, for when I get stuck somewhere with a long wait.

I have a small collection of PDB books from Palmpilot days of the last century, and was delighted to find Caliber which proceeded to convert all of them to Epub - except one.

That consistently fails with the last line of the log:

struct.error: unpack requires a buffer of 2 bytes

This appears to be a Python error, discussed in this [URL="https://www.youtube.com/watch?v=MzKSt1YgL9M"]You Tube link[/URL

I'm a kindergarten level coder, so this is quite possibly my error, or
my problem .pdb file is malformed, but I felt I should report it anyway.

Regards / Tony