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How so I fix this problem on my Xperia Z2 unfortunately system UI stopped
Hi @Don78, sorry to hear about this. 
Are you doing anything specific in the device when you get this error message? Have you tried restarting your device in safe mode and seen if the same error message appars when downloaded applications aren't loaded? If you haven't tried that, please do and report back.
Hata devam ediyor
Error in progress
gt
Hata devam ediyor
Error in progress
gt
Hi @Kemal_55,
Your question has been translated to English as this is an International forum.
I'm not really quite sure that I understand what you mean, would it be possible for you to use a translation service and make a new post?
Thank you.