Hello, 

I am following the instructions to customise the welcome message on the Rooms page.

Instructions: https://github.com/oTree-org/custom-room-welcome-page

However, I am running into the following error:

"module 'jinja2' has no attribute 'contextfunction'"

How can I address this? It seems like it might be a problem with the version of jinja2?

Thnaks.