Mirroring icon appearing and no external display connected

Hi guys!
Recently I bought an iPad and updated my mac to the latest version of OS X Yosemite. All from sudden, the mirroring icon appeared on the top bar of my mac. When I click it I can only open display preferences, which only shows my macbook. I can hide it by unchecking that box, but I don't think this should be the right solution.
I have already restarted the computer and also tried clicking on Detect display option by holding the option key.
Thank you!

Today it started to work by it self.
So for now the case is closed

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Mirroring icon appearing and no external display connected

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