ipptool client-error-document-format-not-supported

The command line command: ipptool http://192.168.1.102:631 print_pdf The contents of print_pdf: { VERSION 2.0 OPERATION Print-Job REQUEST-ID 5 GROUP operation-attributes-tag ATTR charset "attributes-charset" "utf-8" ATTR naturalLanguage "attributes-natural-language" "en" ATTR uri "printer-uri" "http://192.168.1.102:631 " ATTR name "requesting-user-name" "John" ATTR mimeMediaType "document-format" "application/pdf" FILE "steampunk.pdf" } EDIT: Now I have the error client-error-document-format-not-supported, even though this is the standard application/pdf format. The docs in the repository do not discuss this error too thoroughly. The image below appears to be where the issue is raised, something to do with a ppd file? What could be the issue?