Need help with Backendless

I am following the backendless and bubble integration tutorial from Database and Scalable Codeless Backend For Your App

But when I try to initialize the call it gives me this error.

I generated the API doc from the data tab in backendless. Then pasted the path in the Post section in bubble API plug in and did all the other steps. Is there something that I am missing or maybe need to do on backendless?

I am a newbie. Any and all help us highly appreciated :grinning:

Thank you.