The output created or modified has no features. For instance, running Delete Features or Delete Rows on a feature class or table would remove all features. A common occurrence of this warning occurs when the Extent or XY Domain 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 or XY Domain environment to ensure that it is appropriate for the data used.