Your stand-alone table references a data source that is not registered with the geodatabase and you are publishing a map service with feature service or WFS capabilities.
Solution
- Register the stand-alone table with the geodatabase.
- Alternatively, you can remove the stand-alone table from the data frame.
More information
All data in the map must be registered with the geodatabase if you are publishing a map service with feature service or WFS capabilities. Registering a table with the geodatabase adds records to the geodatabase system tables and allows you to use geodatabase functionality.
Learn more about authoring feature services and authoring WFS services
Caution:
This is not the same as registering the data source with the server. Registering a data source with the server helps ensure that the server has access to all the data that the GIS service references. If a data source is not registered with the server, the data referenced by a layer in a map that you are publishing will be copied to the server. If you are publishing a map service with either feature access or transaction-enabled WFS (WFS-T) capabilities, data will be copied to the geodatabase registered on the ArcGIS server using the Server only connection type.
Learn more about registering the data source with the server