Hi, I'm Robert and I'll be helping you with your printer question.
check on the printer menu what paper it thinks that it has in each tray. It should be plain and letter for the cassette
I don't know what you have tried yet. I have to start with the most obvious solutions
What is happening is that for some reason the copy is set to go to a tray or type of paper that the printer thinks is not where it is supposed to print to
The next thing to check is everything about the copy
Is it too large is it supposed to shrink it expand is it set to go to a different tray