Word won't let me save as PDF

Hi.

I have over the past couple of weeks not been able to save my word documents as PDF documents. I used to able to but it won't let me now, and gives me an error message that looks like this: 

I don't know what to do, I use that feature all the time, and I feel like I've tried everything trying to be able to do it again. I tried to go through the print tab but that won't even open.

Anyone has any idea how to fix this issue. Greatly appreciated, thank you.