Highcharts Error #22 Map does not support latitude/longitude

When you are trying to use custom GeoJSON to draw a map using Highmap, you will get this error "Highcharts Error #22 Map does not support latitude/longitude".

Reason:

1. It is because of custom GeoJSON you had is not supported projection format of the HighMap.
2. Maybe you have not included proj4.js file in your html file.

   <script src="https://cdnjs.cloudflare.com/ajax/libs/proj4js/2.3.6/proj4.js"></script>
   

3. Maybe custom GeoJSON doesn't have projection (CRS) related information i.e. hc-transform in it.

   "hc-transform":{ 
       "default":{
           "crs":"+proj=mill +lat_0=0 +lon_0=0 +x_0=0 +y_0=0 +R_A +datum=WGS84 +units=m +no_defs"
       }
   }

Please refer following tutorial to create custom GeoJSON from scratch and also using same GeoJSON and draw highmaps. Custom HighMaps GeoJSON World Map Using QGIS