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A 304 error message means that the requested resource has not been modified since the last time it was accessed. This could indicate that the page or script you are using to calculate BMI is making a request to another resource, such as a CSS or JavaScript file, that has not been modified but is being requested again, causing the error message.

Clearing your cache, cookies, and browsing history may not necessarily resolve this issue, as it is likely a problem with the code or server configuration. You may need to review the code used to calculate BMI and check for any errors or issues with resource requests. Additionally, you could try accessing the page using a different browser or device to see if the issue persists.