You are sharing a web layer that contains either an Arcade or VBScript label expression.
Arcade label expressions are supported when sharing to ArcGIS Online and Portal for ArcGIS 10.5 or later. VBScript field names, not expressions, are supported to all portals.
- The provided solution will open the Label Class pane so the label expression can be modified.
- If you are sharing a tile layer, change your caching option to Cache locally.
- Do nothing, the label will be dropped.
For more information on label expressions, see Specify text for labels.