Facing the same issue. Was working fine previously.
On checking with the host, was advised to provide direct PHP file access. This is a less secure option, but the PDF is displayed when access is provided.
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This reply was modified 5 years ago by dushyanth.
My mistake ‘Unspecified’ refers to the shipping class label.
Thank you, it’s working now 🙂
Misinterpreted the instruction on the page: ‘Fill with 0 (zero) to set as free shipping. Leave blank to disable.’