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When the data type received in rtk query is undefined, it means that the request returned with no data or an unexpected response format. This can occur if there was an error with the API request, the server is down or inaccessible, or there was an issue with the data format or payload. It could also mean that the endpoint being queried doesn't exist or is not accessible. In these cases, it is important to check for error messages in the response and debug the request to resolve the issue.