Default Self-made custom rom doesn't work?

Hi there,

I have a samsung galaxy s4 sgh-i337m and I tried making a custom rom using Android Kitchen.
I downloaded the right rom for my phone and unpacked it, added SU and BusyBox, deodexed it, and zip ligned it and signed it. But everytime i run it, it gets stuck on the bootloading screen, I cleared my cache and everything and I can still install another custom rom but I want to try and make my own so what am I doing wrong? I've tried this over 10 times rebuilding it and it doesn't work