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If you've been linked to this, you probably made a language mistake and whoever sent this to you cared enough to point it out. The best thing to do is read the details and see where you went wrong.
There is no "Kelvin degree", just a unit, "kelvin", because, unlike the Celsius and Fahrenheit scales, the Kelvin scale actually measures the amount of temperature (proportional to the average amount of energy of the particles in a substance). While there exist negative values of temperature in the Celsius and Fahrenheit scales, 0 kelvins is the lowest possible temperature, representing no temperature, a theoretical state known as "absolute zero."
Additional Note: Although Kelvin is a proper name, "kelvin" as a unit should not be capitalized, as in "300 kelvins".
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