** ERROR 304240 ** Attempted to read a beam element type not supported for 3D Flow. The element id is element number.
Explanation
The mesh contains one or more beam elements of a type not currently supported for a 3D Fill+Pack analysis. The label number of the first such element that was found has been listed.
Resolution
Check the mesh. (Try selecting by Properties). Delete or edit the unsupported elements and rerun the analysis.