You are sharing a map image layer that contains a utility network. When sharing a utility network, all user attribute fields must be set to visible in the layer or table properties. The field will be indicated by the first <value> parameter and the dataset will be indicated by the second <value> parameter.
Solution
- Hover over the analyzer message. Click the Options button
that appears and click Select Layer In The Contents Pane. On the ribbon, under Feature Layer, click the Data tab. In the Design group, click Fields 
. In the Fields view of the table, check the box in the Visible column to make the field visible.
More information
For more information on field visibility, see View and edit a layer's fields in the fields view.