Description
The building layer contains duplicate model names. For example, two layers in a building layer both have a floors name alias. Model names allow clients to identify entities of a building without having to rely on a specific name of a category layer.
Solution
Run the BIM File To Geodatabase tool and specify a different value for the Output Geodatabase parameter.
Alternatively, update the alias for any feature class with a duplicate alias. See define feature class properties for more information.