An unsupported graphic element is present in the graphics layer. For example, picture graphic elements are not supported as part of feature collections in web maps.
Solution
Do nothing. The unsupported graphic elements will not be included with the published feature collection.
Alternatively, remove the unsupported graphic elements from the graphics layer, or remove the graphics layer from the map.
More information
If a graphics layer is present when a web map is published, the layer is converted into a feature collection. For more information, see Graphics layers and Work with graphic elements in a map.