Error code 3038 Unable to join this webinar The webinar has expired

[Boeun]

We have a huge online event this upcoming Sunday and I had made the webinar link.

But when it clicked, it says 

"Unable to join this webinar. The webinar has expired. (Error Code : 3038)"

But in my reserved webinar list, this webinar room exists.

Does anyone know how to solve this situation?