after update to OS 8.1 in lumia 520 calender is not getting opened..

[WPCentral Question]

Hello there..!!!
When I updated my lumia 520 from OS 8 to OS 8.1 my calender is not getting opened. If I tap and hold calendar, the only option that I get is "Pin to start" so coz of this I'm unable to Uninstalled it too. So how can I download new one, if my old calender is not only getting uninstalled r open.
I've even tried searching it in download queue in app store but there also it is not showing, so please solve this problem....
Thank's in anticipation....

 

[TheAquila]

Did you update the app after the update?

 

[BatteryLife]

Sometimes apps cant be opened. I don't know why.

Reboot your device or soft reset your phone by holding down both power and volume down button for around 15 seconds. Your calendar should work fine.