The SampleData provided in the /Samples folder of the repository points to data in the sample data folder. This data was supplied as sample data for learning about Spectrum Spatial. During an upgrade it could change or be removed. It is the product's data.
Maps that you are using in your organization should use your own data. In the unlikely event that your tables are named the same as the ones in our samples, it is possible that this message would appear. This would occur if you have not copied your own copy to the server or have not created a Spectrum Spatial connection to that data. Other than a temporary demonstration, it is recommended that you do not use the sample data for your own maps.