Error on Sync of Yahoo CalDAV (Bad Request)

I started receiving this error message about two months ago. I have used eM Client for about two years and did not have this problem before. I’ve heard there was some kind of bug in the Yahoo calendar about a year ago, but my problem just started recently. Here is the message:

[CalDAV] Sync of [email protected]/Doug Walker failed due to the following error: [email protected] (Bad Request)

It happens every time I open eM Client, or at least it appears that way. Please let me know what you think. Thank you!

This is a server error. You will need to contact Yahoo! for assistance with fixing it.

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What does this error mean?:

[CalDAV] Sync of [email protected]/Ann Miller failed due to the following error: [email protected] (Bad Request)

[CalDAV] Sync of [email protected] failed due to the following error: [email protected] (Bad Request)

I use an app password from Yahoo but still get this error. What is causing it and how do I fix it?