Dissolve ERROR 999999: Error executing function. The Geometry has no Z values.

Solution to Dissolve ERROR 999999: Error executing function. The Geometry has no Z values.

ArcToolbox>Repair Geometry and delete features with empty geometries
ArcToolbox > Conversion Tools>To Shapefile>Environments>General Settings>Output has Z values = Disabled, Output has M values = Disabled>OK>Input features/Output features>OK

ArcToolbox>Dissolve> happy :))

Source

ArcGIS , ArcMap