When copying a template in the coursesandevents app of 2sxc. We are getting an error :

error CS0234: The type or namespace name ‘Data’ does not exist in the namespace ‘AppCode’ (are you missing an assembly reference?)

while we are using the exact same code of the original file : live/List.cshtml

What are we missing?

we are currently using version:
DNN: 09.11.00
2Sxc: v18.0.0
Coursesandevents v6.17.1

We created a new view, and copied the exact same template code of List.cshtml