java.lang.IllegalArgumentException: Access key cannot be null.

Hello, I'm having an issue with the Amazon S3 Utils plug-in, 

We're currently trying to use the "Amazon S3 Upload Objects" smart service in a process model, and it keeps showing us an error of "java.lang.IllegalArgumentException: Access key cannot be null.", and the node is configureted like this :

And the Third-party credentials is like this

So the connection works...

Does anyone knows what to do? 

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