You need to use ODIN to flash the original firmware back to your phone (MK2 from the looks of it). Then, install safetrap using the instructions available in the Safestrap thread. Make sure you read the entire thread before you do anything. As already mentioned, only safestrap will work with your phone, not Goo Manager and not ROM Manager.
SGH-I337 (AT&T) 32GB
P-ROM (1st Gen.), De-Odexed, AMDL
Auto-LOKI OUDHS CWM
Make sure you read and understand the "PINNED" threads in the "General" and "Q & A" sections of the AT&T S4 forum BEFORE you ask for help. Use the forum's "search" function to find posts with additional information. You should not expect others to help you if you haven't tried to help yourself first. Also, read, understand, and follow the "XDA" rules.