"Unfortunately, System Ui has stopped" when i open my phone

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Android Central Question

I have a HTC desire 820 ! When i try to open my phone this message pops up :
Unfortunately, System Ui has stopped ! I can't access the home page or anything ! When i click "Ok" it just closes then opens up again ! Not reboot just a normal closing.
If anyone could help me somehow i would highly appreciate it ! And i repeat ! I can't access any of my apps ! Thanks !