Pdf printing problem

firstly, sorry for my english

why this message apper when i click the “PDF” button.
its happened after i run the latest verson
it never happen before
tqvmnull reference

Are you using custom HTML theme?

Yes sir,
i’m using custom theme
tq

When you use custom themes, you are responsible for the functionality of your coding. If you do not have the skills personally, hire a local programmer.