How to use Global Value?

i created a global value on AAE_Admin and set the name into "Test" with the value as "Test"

then i go to bot creator to try to call the global value on a message box but there are no variable with the name "Test"

So i used "$@" so that it would give me the list of the global value but when i try to click the variable it gave me this error

the error has been solved but did i do anything wrong since the global value still did not appear and i'm afraid if i use the "$@" again it would gave me the same error