I'm currently making a mod pack and my game is crashing on start up.

the crash report is here:
https://drive.google.com/file/d/1ln3LFO1oVAA4QqO2F7sWZ1SCjt3gn5RG/view?usp=sharing

and my rewards.json file (the only thing I've changed) is here: https://drive.google.com/file/d/1GG7EKFsbPHOaeJt_vU0jhpJDFgpbujry/view?usp=sharing

I had a few errors at first related to invalid syntax, wither missing a '{' or ';' but now my crash report is saying
Caused by: net.minecraft.nbt.NBTException: Expected '{' but got '' at: <--[HERE]
and I have no idea what exactly it wants me to change. I've triple checked my file and ran it through a JSON Validator to make sure, but I still cant figure out what I've done wrong.

any help would be greatly appreciated

never mind I figured it out, I accidently had and empty nbt line under one of my rewards, deleted it and now it works properly.