Path to pdftotext reports error "The file /usr/bin/pdftotext does not exist."

Problem/Motivation

Inserting the pdftotext path results in "The file /usr/bin/pdftotext does not exist."

Steps to reproduce

Server root shows pdftotext installed at /bin/pdftotext

SSH from site:

[user@web mysite]$ which pdftotext
/usr/bin/pdftotext

So I enter path as /usr/bin/pdftotext. I have also tried /usr/bin which results in a server error.

Assistance requested please.