stevem on "[Plugin: Wordfence Security] Keep getting api errors when trying to view files that were modified"

I too am getting the same error for any modified file:
WordFence API error: An error occured trying to open the requested file.
when clicking on See how the file has changed in Modified plugin file.
View the file still works and I get the same result whatever the status of 'disable config caching'
It used to work, the previous one I checked was 1 month 17 days ago but now I cannot check it again.