You will get this error message if the API Key is not Deactivated properly. Please follow the steps below to solve the error.
Go to Woo Feed > License and click on the Manage License button.
The manage license button will redirect you to the license management page into our site. Now you have to log in to manage your license. After that, you will see the list of sites you have activated the license. Now click on the Delete button for the site you are trying to activate the license.
Now copy the Master license key from the top of the page and go to the plugin license activation page (Woo Feed > License) into your site and activate the license.