# Dynamo Tower \> Conceptual Mass \> Project not working properly

**URL:** <https://forum.dynamobim.com/t/dynamo-tower-conceptual-mass-project-not-working-properly/45037>\
**Category:** Revit\
**Tags:** dynamo\
**Created:** [January 3, 2020, 5:46am UTC](https://forum.dynamobim.com/t/dynamo-tower-conceptual-mass-project-not-working-properly/45037 "2020-01-03T05:46:41Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![cobipal](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.dynamobim.com/cobipal/32/87202_2.png) [@cobipal](https://forum.dynamobim.com/u/cobipal)\
**Post date:** [January 3, 2020, 5:46am UTC](https://forum.dynamobim.com/t/dynamo-tower-conceptual-mass-project-not-working-properly/45037/1 "2020-01-03T05:46:41Z")

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Unable to create floors, walls, or roof on this conceptual mass which was made with Dynamo in Conceptual Mass Family. Am I missing something?  
The below error shows up

“Mass contains only mesh geometry, which can’t be used to compute Mass Floors, volume, or surface area”

[Tower\_New.dyn](https://forum.dynamobim.com/uploads/short-url/nRZhJf3NOMdBPykcaMeD6rmWvg5.dyn) (88.8 KB)

 ![Capture11](https://us1.discourse-cdn.com/flex022/uploads/dynamobim/original/3X/7/9/7985b94ce110c140bf2565022e7103e76e2390fb.png)

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**Author:** ![architectcoding](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.dynamobim.com/architectcoding/32/105118_2.png) [@architectcoding](https://forum.dynamobim.com/u/architectcoding)\
**Post date:** [January 3, 2020, 11:18am UTC](https://forum.dynamobim.com/t/dynamo-tower-conceptual-mass-project-not-working-properly/45037/2 "2020-01-03T11:18:06Z")

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As the error states, you need a solid, a closed 3d.

[https://dictionary.dynamobim.com/#/Geometry/Solid](https://dictionary.dynamobim.com/#/Geometry/Solid)