Apple internet calendar

I have an link to my wife’s Apple calendar for some time and it has worked faultlessly. However about a month ago it started to error although the data seemed to update. I thought it could be due to an Apple update and tried a new  link, but it still had an error. 
Is there a fix?
Thanks

EmClient Ver 7.0.30068.0
Still happening even after recent update.

Peter

Still happening!!

Is there a solution for this error? Calendar updates are not happening.
Please note, this post goes back a month without reply.

i use https://caldav.icloud.com/
and all the caldav books are sync from icloud

I have upgraded to 7.1.30469.0, and it still happens.
Lieven, thanks for your suggestion. It could be a workaround for me but ‘Add an Internet Calendar’ in eMC should work. It used to!