G'day justin423,

"couldn't find command '/usr/bin/wkhtmltopdf' at ..."

The documentation for WKHTMLTOPDF shows /usr/bin/wkhtmltopdf as the default. You appear to be on an MSWin system so it's unlikely that path would exist. It provides a bin_name to change that. I'd suggest starting there.

You've also got a whole swag of other issues that I recommend you address. Here's a few that stand out; there could well be others.

• Missing strict and warnings pragmata.
• Use of package variables.
• Indirect object notation.
• _input_file() and _output_file() methods are repeated.
• Non-interpolating single quotes around variables.

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