N910c system ui stopped when taking screenshot

I am using Galaxy note 4 N910c with eRobot rom ver 10.1 . After i installed a theme on theme store i took a screenshot but phone said : " Unfortunately , System UI has stopped " . I deleted the theme and used the default theme but system ui still crashed . Can anyone help me please . Thank you very much
P/s : sorry for my english i am not good at english :(

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