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Describes an error that has occured while loading the Map. The `type` property defines what resource could not be loaded and the `message` property will contain a descriptive error message. In case of `source` or `tile` loading errors, `source-id` will contain the id of the source failing. In case of `tile` loading errors, `tile-id` will contain the id of the tile ``` text Event data format (Object): . ├── type - String ("style" | "sprite" | "source" | "tile" | "glyphs") ├── message - String ├── source-id - optional String └── tile-id - optional Object ├── z Number (zoom level) ├── x Number (x coorinate) └── y Number (y coorinate) ```