Default Repartition failed - bootloop

Hello, I was trying to install this rom for my s3 lte, i did everything as it was listed in the instruction field, but when i was flashing the rom i get an error that says that repartion failed. So, I have restored my old rom form backup, but the phone doesnt boot now (its stuck on the galaxy s3 logo).

What can i do in this situation? Thanks for help in advance.