# Having trouble with adding my own map special

**URL:** https://discourse.cataclysmdda.org/t/having-trouble-with-adding-my-own-map-special/27105
**Category:** The Toolbox
**Created:** [September 29, 2021, 4:16pm UTC](https://discourse.cataclysmdda.org/t/having-trouble-with-adding-my-own-map-special/27105 "2021-09-29T16:16:46Z")
**Posts on this page:** 1
**Page:** 1

<div class="post-metadata">

### Author: ![Bio](https://sea2.discourse-cdn.com/flex016/user_avatar/discourse.cataclysmdda.org/bio/32/6690_2.png) [@Bio](https://discourse.cataclysmdda.org/u/Bio)
#### Post date: [September 29, 2021, 4:16pm UTC](https://discourse.cataclysmdda.org/t/having-trouble-with-adding-my-own-map-special/27105/1 "2021-09-29T16:16:46Z")

</div>

I just started programming my own custom buildings from scratch for a mod i’m making however i’m having trouble getting the game to recognize them in the overmap.  
The coding for my custom building is pretty simple consisting of only one z level and only a few pieces of terrain and 1 furniture so I don’t see what I could be possibly missing.

> ````auto
> {
> "type": "mapgen",
> "method": "json",
> "om_terrain": [["exposed_road"]],
> "object": {
> "fill_ter": "t_pavement",
> "rows": [
> "........................",
> ".......o................",
> "........................",
> "...........p|p..........",
> "..........pp|pp.........",
> "..........pp|pp.........",
> ".......o..pp|pp..o......",
> "..........pp|pp.........",
> "..........pp|pp.........",
> "..........pp|pp.........",
> "..........pp|pp.........",
> "..........pp|pp..o......",
> "..........pp|pp.........",
> "..........pp|pp.........",
> "..........pp|pp.........",
> "..........pp|pp.........",
> ".......o..pp|pp.........",
> "..........pp|pp.........",
> "..........pp|pp.........",
> "..........pp|pp.........",
> "..........pp|pp.........",
> ".......o..pppp...o......",
> "............p...........",
> "........................"
> ],
> "place_vehicles": [
> { "vehicle": "motorcycle", "x": 10, "y": 30, "chance": 15, "rotation": 180 },
> { "vehicle": "car", "x": 15, "y": 30, "chance": 50, "rotation": 180 }
> ],
> "terrain": { ".": "t_sand" ,
> "|": "t_pavement_y",
> "p": "t_pavement" },
> "furniture": { "o": "f_street_light" }
> }
> },
> {
> "type": "mapgen",
> "method": "json",
> "om_terrain": [["start_road"]],
> "object": {
> "fill_ter": "t_pavement",
> "rows": [
> "........................",
> ".......o................",
> "........................",
> "...........p|p..........",
> "..........pp|pp.........",
> "..........pp|pp.........",
> ".......o..pp|pp..o......",
> "..........pp|pp.........",
> "..........pp|pp.........",
> "..........pp|pp.........",
> "..........pp|pp.........",
> "..........pp|pp..o......",
> "..........pp|pp.........",
> "..........pp|pp.........",
> "..........pp|pp.........",
> "..........pp|pp.........",
> ".......o..pp|pp.........",
> "..........pp|pp.........",
> "..........pp|pp.........",
> "..........pp|pp.........",
> "..........pp|pp.........",
> ".......o..pppp...o......",
> "............p...........",
> "........................"
> ],
> "place_vehicles": [
> { "vehicle": "motorcycle", "x": 15, "y": 15, "chance": 100, "rotation": 180 }
> ],
> "terrain": { ".": "t_sand" ,
> "|": "t_pavement_y",
> "p": "t_pavement" },
> "furniture": { "o": "f_street_light" }
> }
> }
> ]```
> 
> ````

this seems to be acceptable for the game since when I add it in it says "nothing is using “exposed\_road”!  
however the game contradicts itself when I add the game in an overmap file and says

```auto
DEBUG : invalid overmap terrain id "exposed_road_north"

 FUNCTION : const T& generic_factory<T>::obj(const string_id<T>&) const [with T = oter_t]
 FILE : src/generic_factory.h
 LINE : 445
 VERSION : f45fb00

```

when I have only put an equally simple and uncomplicated overmap coding like so

```auto
 {
    "id": "exposed road",
    "type": "overmap_special",
    "locations": ["land"],
    "overmaps": [
      { "point": [1, 1, 1], "overmap": "exposed_road_north" }],
"occurrences": [0, 1]
},
{
    "id": "starter road",
    "type": "overmap_special",
    "locations": ["land"],
    "overmaps": [
      { "point": [1, 1, 1], "overmap": "exposed_road_north" }],
"occurrences": [0, 1]
}
]

```

Am i missing anything here? Why is this causing such a problem?