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What Happened?

You are trying to access a test image with a live api key, or vice versa. The image mode does not match the required mode, and you will receive this error.

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How to Prevent or Fix

Make sure you are using the correct API key for the image mode you want to access. If you need to access a test image, use a test API key. If you need to access a live image, use a live API key.