A new version that fixed the issue is now being distributed to you. (link)
Once again I’m sorry for your inconvenience and Thank you for your understanding and generosity.
지금 이슈가 수정된 새 버전이 배포되고 있습니다.
다시 한 번 불편을 드려 죄송하며 이해해주심에 감사드립니다.
Happy New Year!
I’m very sorry that the issue has occurred since the new year
The issue have been occurring in WFS since the new year due to issues with abnormal behavior in the process of reading system date.
We’re preparing new version Now, and it will be distributed within this week.
Temporarily to use WFS, you can change the date of the PC to a month other than January
But this date changes can affect other programs, such as accessing web pages or anothers. Since new version will be released, please change it to the current date after installing the new version.
Once again, I sincerely apologize for your inconvenience.
Thank you for the heads up Catherina. And a happy new year to you too.