I'm trying to use this plugin and I'm following the documentation but I have 2 erros that I can´t solve.
I appreciate all the help you can give me.

First one, what is supposed to be in "GetUserThumbnail"? It appears out of nowhere.

Second one, what is variable "TheNotification"? I don't remember having defined any variable with that name so i can't access to UserId.

Basicly I'm having these 2 erros and I need to solve them in order to test the notifications.