# No Valid Objects

<figure><img src="/files/n8u2DTChMCJdWIZ8hxF7" alt=""><figcaption></figcaption></figure>

We consider only closed polysurface objects from Rhino. If you encounter this error, it means we could not find any closed polysurfaces in your model.&#x20;

&#x20;if you massings consist of extrusions, you can convert them to polysurfaces by using the `ConverExtrusion` command. <https://docs.mcneel.com/rhino/7/help/en-us/options/general.htm#ConvertExtrusion>

* You can select all extrusions by using the `SelExtrusion` command.&#x20;
* With all extrusions selected you can use the `ConvertExtrusion` command with the `DeleteInput` option.

<figure><img src="/files/yPLNcQLs46R2ZXEfOmtx" alt=""><figcaption></figcaption></figure>

if your massings consist of meshes, please rebuild them as closed polysurfaces.


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