We released version 4 of the WpStream plugin back in September 2021 and striven to maintain compatibility with customers running version 3 so that they can enjoy continued use of the product.
As maintaining such compatibility requires time and effort on our side, we decided to discontinue the older version starting Jan 15th 2022. After that time, plugins older than v4 will no longer function as intended.
Please upgrade your plugin now to avoid any disfunctionalities.
So sorry to hear that you are having issues with going live. Please make sure you have the latest version of the plugin installed. If you do have the latest version and are still getting this error, can you please confirm if this happens with your old channels or with any newly created channels as well?