Notification error after contact from successful

Hi
I set up a success Notification message (when submit contact form) as explained in the tutorial, now when I hit the Send button the notification don’t show and in dev tool I see this error message:

I found some possible explanations like spacial characters (French in my case) causing this but I tried with “OK” as notification message and got the same error.

https://vr-surlepouceinc.com/#contactbox

Any idea how to solve this?

Thank you

As explained in the documentation you should wrap the static text in single quotes:
'static message'

Sorry I missed that line in the toturial…Work fine now!

Thank you again Teodor