How can i fix the error message when i dp a system reboot

I have a rooted s4 mini and it shows the "unfortunately (app) has stopped working" messages I've cleared cache and data and I've been told to do a reboot as well. I put the phone into recovery and as soon as I press reboot system then android guy pops along with Error! And the phone starts up. Any ideas as to why this is happening or how to fix it? Thank you

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