Issue
When printing PDF's to HP M477fdn Printers using Apple native PDF reader Preview, It may give you an error saying that "font is invalid" resulting in you not being able to print your document.
Workaround
If you open the PDF with Adobe Acrobat Pro, you can print to HP M477fhn printers without running into this error. To set Adobe Acrobat Pro as your default PDF reader, please follow the instructions in the wiki located here to assist you in this process.
The secondary option is to print to another printer nearby that is not an HP M477fdn.
If you continue to have any issues with printing, please reach out to the IGPP HelpDesk for additional support.