Some styles contain symbols with licensing restrictions. Restricted symbols cannot be shared. For example, the 3D Industrial system style contains 3D models that are restricted by licensing. Esri is not authorized to share the 3D models outside of ArcGIS Desktop applications, so a web style cannot be generated from the symbols in this style.
The <value> parameter refers to the symbol name.
Right-click the analyzer message and click Open Style in Catalog View. Right-click the symbol item and click Delete .
The option to delete the symbol is disabled when the style is read-only. You may need to upgrade the style first to delete the symbol.