I’m getting this error when I download using the ical download button. “Calendar can’t read this calendar file. No events have been added to your calendar.” It was happening before and continues now that I’ve updated to the latest plug-in. How can I make it work?
When I view the resulting .ics file I can see that it is being modified by WP Super Cache which is appending an HTML comment to the bottom of the file. Of course, it isn’t an HTML file at all and that is quite likely to be causing this problem.
With that in mind, can you try removing WP Super Cache (follow the vendor’s advice on doing so closely, as merely deactivating it does not always guarantee its effects will cease) and see if that remedies the issue?
I fixed it by going into the WP Super Cache settings and putting the string /calendar/ in the do not cache field, then deleted the cache and now it works. Thank you for pointing me in the right direction!