What does it mean when rapidapi indicates that the API key is invalid and data retrieval is undefined while working on a project with rapid api?

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It means that the API key you provided to access the data source is incorrect or invalid. As a result, you are unable to retrieve data from the API and the output is undefined. You should check your API key to ensure it is correct and valid. It is also possible that the API key has been blocked by the source for some reason, so you may need to contact the API's support team to resolve the issue.