I'm making a new mod that adds a few additional signals. I keep getting this error on startup:

My mod folder is `radio_0.0.1`, and my info.json is:
Code: Select all
{
"name": "radio",
"version": "0.0.1",
"title": "Radio Signals",
"author": "aubergine18",
"description": "...",
"homepage": "...",
"factorio_version": "0.13",
"dependencies": ["base >= 0.13.0"]
}
Code: Select all
data:extend {{
type = "item-group",
name = "signals",
icon = '__RADIO__/graphics/grp-signal.png',
order = "y",
}}
data:extend {{
type = "item-subgroup",
name = "vs-radio",
group = "signals",
order = "a[vs-radio]"
}}
data:extend {{
type = "item-subgroup",
name = "vs-snoop",
group = "signals",
order = "b[vs-snoop]"
}}
... then a bunch of signals
Anyone know why I'm getting that error about __RADIO__/graphics/grp-signal.png ?