ICal won't start on my iMac

iCal will not open on my iMac.   There is a question mark over top of the icon and when I right click on it all I get is 2 options...."remove from dock" or "show recents".   When I click on "show recents" nothing happens.    iCal is working perfectly fine on my iPad and iPhone and was working just fine yesterday on my iMac.   Any suggestions?

I finally figured it out.....went to Finder and it opened fine from there.    Removed the icon that had the questionmark on it and dragged a new one to the dock and everything is working fine

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