Contrast button not working after updating to Yosemite.

I have Macbook Pro Mid 2012 version. I just updated to OS X Yosemite and I noticed that contrast button on keyboard is not doing anything. It shows an error like in this picture

      This link may help you. Ipad unresponsive or not sycning!

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          This link may help you. Ipad unresponsive or not sycning!

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