Problem to make it works

Hi.

I’d like to use your plugin with “Caldera forms” to submit datas to my CRM account.
For that, as described in the documentation, I’ve created an API
credentials, filling the API fields and apparently success to connect the plugin to the API, as I had to click on the button “Accept” (to allow Caldera forms app to connect to my Zoho account).
But now I have that problem :
Just after the click on the “Accept” button, I’m redirected to my website where I read the following error :
invalid_client (displayed twice) and if I try to ignore this messages, in my Caldera Forms, on the “Porcessors” tab, I have the errors:

Errors
This processor is causing the following errors:

A valid URL was not provided.
A valid URL was not provided.

What does it means??
What did I do wrong?? What do I have to do to make it works, please?

TIA for your precious help.

All the best.

Pierre.