I had the same issue on one of the sites I manage. After FTPing in to the server, I created a folder called “inactive” under my plugins folder. I then placed ALL plugins in this folder. The site came right back online. Then I added each plug in one by one back into the plugins folder. The plugin I found to be the culprit was in a folder called “podcasting”
All my other plugins have been placed back where they were originally installed & the site is working properly again.
I hope this helps!