I can't create a session variable can anyone help me out

Same here, this is broken or the docs are wrong.

bump! can't seem to use this either .

Bump, I am not able to set a session variable either. The docs make it sound straight forward but it doesn't allow me? I tried using both

event.state.session.testVar = "testValue"

and

session.testVar = "testValue

Anyone able to point in the right direction?

try it with single '' like

'Hello World'