Use a nicer URL for the error descriptions

doc/errors/index.md

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+---
+title: Errors
+layout: doc.hbs
+---
+
+# Errors
+
+### 1
+
+The view center is not defined.
+
+### 2
+
+The view resolution is not defined.
+
+### 3
+
+The view rotation is not defined.
+
+### 4
+
+`image` and `src` cannot be provided at the same time.
+
+### 5
+
+`imgSize` must be set when `image` is provided.
+
+### 6
+
+A defined and non-empty `src` or `image` must be provided.
+
+### 7
+
+`format` must be set when `url` is set.
+
+### 8
+
+Unknown `serverType` configured.
+
+### 9
+
+`url` must be configured or set using `#setUrl()`.
+
+### 10
+
+The default `geometryFunction` can only handle `ol.geom.Point` geometries.
+
+### 11
+
+`options.featureTypes` should be an Array.
+
+### 12
+
+`options.geometryName` must also be provided when `options.bbox` is set.
+
+### 13
+
+Invalid corner. Valid corners are `top-left`, `top-right`, `bottom-right` and `bottom-left`.
+
+### 14
+
+Invalid color. Valid colors are all [CSS colors](https://developer.mozilla.org/en-US/docs/Web/CSS/color).
+
+### 15
+
+Tried to get a value for a key that does not exist in the cache.
+
+### 16
+
+Tried to set a value for a key that is used already.
+
+### 17
+
+`resolutions` must be sorted in descending order.
+
+### 18
+
+Either `origin` or `origins` must be configured, never both.
+
+### 19
+
+Number of `tileSizes` and `resolutions` must be equal.
+
+### 20
+
+Number of `origins` and `resolutions` must be equal.
+
+### 21
+
+Tile range for `extent` must not exceed tilegrid width and height.
+
+### 22
+
+Either `tileSize` or `tileSizes` must be configured, never both.
+
+### 23
+
+The passed `ol.TileCoord`s must all have the same `z` value.
+
+### 24
+
+Invalid extent or geometry provided as `geometry`.
+
+### 25
+
+Cannot fit empty extent provided as `geometry`.
+
+### 26
+
+Features for `deletes` must have an id set by the feature reader or  `ol.Feature#setId()`.
+
+### 27
+
+Features for `updates` must have an id set by the feature reader or `ol.Feature#setId()`.
+
+### 28
+
+`renderMode` must be `'image'`, `'hybrid'` or `'vector'`.
+
+### 29
+
+`x` must be greater than `0`.
+
+### 30
+
+The passed `feature` was already added to the source.
+
+### 31
+
+Tried to enqueue an `element` that was already added to the queue.
+
+### 32
+
+Transformation matrix cannot be inverted.
+
+### 33
+
+Invalid `units`. `'degrees'`, `'imperial'`, `'nautical'`, `'metric'` or `'us'` required.
+
+### 34
+
+Invalid geometry layout. Must be `XY`, `XYZ`, `XYM` or `XYZM`.
+
+### 35
+
+Unknown GeoJSON object type. Expected `"Feature"` or `"FeatureCollection"`.
+
+### 36
+
+Unknown SRS type. Expected `"name"` or `"EPSG"`.
+
+### 37
+
+Unknown geometry type found. Expected `'Point'`, `'LineString'`, `'Polygon'` or `'GeometryCollection'`.
+
+### 38
+
+`styleMapValue` has an unknown type.
+
+### 39
+
+Unknown geometry type found. Expected `'GeometryCollection'`, `'MultiPoint'`, `'MultiLineString'` or `'MultiPolygon'`.
+
+### 40
+
+Expected `feature` to have a geometry.
+
+### 41
+
+Expected an `ol.style.Style` or an array of `ol.style.Style`.
+
+### 42
+
+Expected an `ol.Feature`, but got an `ol.RenderFeature`.
+
+### 43
+
+Expected `layers` to be an array or an `ol.Collection`.
+
+### 44
+
+`logo.href` should be a string.
+
+### 45
+
+`logo.src` should be a string.
+
+### 46
+
+Incorrect format for `renderer` option.
+
+### 47
+
+Expected `controls` to be an array or an `ol.Collection`.
+
+### 48
+
+Expected `interactions` to be an array or an `ol.Collection`.
+
+### 49
+
+Expected `overlays` to be an array or an `ol.Collection`.
+
+### 50
+
+Cannot determine Rest Service from url.
+
+### 51
+
+Either `url` or `tileJSON` options must be provided.
+
+### 52
+
+Unknown `serverType` configured.
+
+### 53
+
+Unknown `tierSizeCalculation` configured.
+
+### 54
+
+Hex color should have 3 or 6 digits.