Hello Duy,
Thanks for using our plugins and welcome to the forums! I’m sorry about the issue you are experiencing with the Facebook import. Let me try to help you with that.
I checked the feed which is in the screenshot and I managed to get a preview, so it should be working. We just need to find out why it doesn’t want to work for you.
First, please go to the bottom of the Events > Help page and check your event aggregator system status. It should look like this.
Second, renew your Facebook token. To do this go to Events > Settings > APIs tab and click on “Refresh your connection to Facebook” (or a similar button you find there).
Third, try to set up the import again, simply as a one-time import. If that goes, then you can try the scheduled import, if you need that.
Let me know what all that brings.
Cheers,
Andras