The output created or modified has no features. For instance, running the Delete Features or Delete Rows tool on a feature class or table would remove all the features or rows. A common occurrence of this warning occurs when the Extent (or XYDomain) environment has been set previously for a geographically distinct area. Since the Extent environment is used to limit the features used, an inappropriately set Extent environment could exclude all features.
If this warning is unexpected, check the Extent environment to ensure that it is appropriate for the data being used.