Hi Hanchul,
It is always better to create your own post, with full details of your environment and issues. You have tagged on to a post that is 3 and a half years old and has already been solved. One of the forum moderators may come along and move this to a new post for you.
In the mean time, as you have shown the upgrade path you have taken, I found this post that may be relevant as you would have upgraded your Master to 7.7.3 and the initial symptoms appear to be the same. Work through this post and pop back to let us know if it is resolved, or if you require further assistance.
https://www.veritas.com/support/en_US/article.000115748
Hope this helps,
Steve
