This is an analyzer error message when publishing a web tool or geoprocessing service with a data type that is not supported on ArcGIS Enterprise or ArcGIS Server using Python. This will be most commonly encountered with the Composite or Value Table data types.
Solution
Upgrade ArcGIS Enterprise or ArcGIS Server to a version that supports the data type.
If upgrading ArcGIS Enterprise or ArcGIS Server is not practical, modify the model tool so the parameter is not used as a model tool parameter. You can still expose a Composite parameter if it is not saved as a Composite data type when sharing. Rerun the model tool and publish.