Hi Xiaoqianyuan,
Welcome to the WISE Community and thanks for reporting the issue!
This looks like an issue with constraints that are added into the unit. When I look at the unit in the authoring tool, I see that the step numberings are off. At first glance, it is not clear how to fix this easily, but we will take a closer look and see if we can resolve the issue this week.
Thanks for your patience,
WISE Staff
Hi xiaoqianyuan,
I’ve fixed your unit so it can be previewed. I needed to delete a constraint in your unit that was not completely authored. Here is the constraint I deleted. It did not have the “Action” and the “Removal Criteria Name” set.
I will fix the code so this problem doesn’t happen again.
Sorry for the inconvenience,
Geoff