You attempted to share a web layer, web map, or web scene containing a layer that has SHAPE__AREA or SHAPE__LENGTH fields. These field names are reserved for use by map and feature services. Publishing with these field names results in duplicate field names in the web layer. This can cause failures in clients that consume these services.
Solution
Hover over the analyzer message. Click the Options button 
that appears and click Select Layer In The Contents Pane. The layer with the reserved field name is selected.
- Rename the field.
- Delete the field.
Additional information
For more information, see Analyze your GIS resource.