@burnout426 Thank you for the help, but I managed to fix the issue.
I used an online json validator to figure out what was wrong.
The problem was the line of code highlighted. Can't use //.
This is an example.

@burnout426 Thank you for the help, but I managed to fix the issue.
I used an online json validator to figure out what was wrong.
The problem was the line of code highlighted. Can't use //.
This is an example.

I'v been having the same problem, can't upload my mod.