I have any problem with the module /PDFWOPrint.php empty when click paperwork either email or print, even to have uploaded many times but still the same result.
thanks
What version of the software are you running?
Do you have a file named WOPaperwork.xml in companies/<databasename>/FormDesigns/ directory?
Does your Work Order have requirements for components? (worequirements table)
What happens if you go to Main Menu->Setup->Form Designer? Is the form Work Order paperwork Available to select? Can you use the "Preview the Form Layout" button at the bottom of the screen?