error opening file! sh: PAUSE: command not found

[HaitaoShi]

Dear SIr or Madam,

Thank you very much for providing this script. Would you help me solve the problem as follows? Thank you !
I am using Macbook pro with the zsh shell. I also tried bash. But the problem remains.

insert pdf to analyze: /Users/XXX/Downloads/color-wb-pdf-splitter-master/example.pdf
error opening file!
sh: PAUSE: command not found

Best regards,
Heydon