Board Thread:Support Requests - Getting Technical/@comment-25404524-20170807055720

In My Singing Monsters Wiki, when I tried to add a thread to certain boards, they will not allow creation of a thread and will instead lead to a page called "Undefined". When I make the thread in other boards, it will work; but when I move it to the error-making board, the thread will not appear in the board despite the thread still working. I think error-fix this might be a task where only Wikia Staff can physically fix. And any suggestions about how to fix the entire thing, please help. 