Go to that file (magazine.json) and open it in a text editor.
Look at the very first entry, it looks like this:
{
"id": "40_speedloader6",
"copy_from": "40_speedloader6",
"type": "MAGAZINE",
"description": "This speedloader can hold 6 rounds of .40 or 10mm Auto and quickly reload a compatible revolver.",
"ammo_type": "10mm_auto"
},
Problem is, this item doesn’t have a name, symbol, or color. If you know how to add them, add whatever you want it to be. If you don’t know how to do it, then copy what I have posted below. Paste these lines under the “copy_from”: 40_speedloader6", line.
"name": ".40 speedloader",
"symbol": "#",
"color": "light_gray",
I’m not affiliated with the mod, I just added it as I saw necessary. You can change the name or whatever if you want.
In the end, your first entry should look like this:
{
"id": "40_speedloader6",
"copy_from": "40_speedloader6",
"name": ".40 speedloader",
"symbol": "#",
"color": "light_gray",
"type": "MAGAZINE",
"description": "This speedloader can hold 6 rounds of .40 or 10mm Auto and quickly reload a compatible revolver.",
"ammo_type": "10mm_auto"
},
This will allow you to create a character without any errors if you’ve done it right.