BAPI connector not working

Hi All,

am trying to use BAPI connectors in process model, also i have created a Third Party Credentials and passed the Key to the Smart connectors in Process Model, But am getting a below error,

"You do not have credentials configured for this system [key=sap_bapi_connectors]. Please navigate to the Third-Party Credentials page in your Settings and provide credentials for this system."

What is it that am doing wrong.

Thanks in advance