# All element of category errors

**URL:** <https://forum.dynamobim.com/t/all-element-of-category-errors/51246>\
**Category:** Revit\
**Tags:** revit, python, dynamo\
**Created:** [May 31, 2020, 12:38pm UTC](https://forum.dynamobim.com/t/all-element-of-category-errors/51246 "2020-05-31T12:38:15Z")\
**Posts on this page:** 1\
**Showing post:** 4

<div class="post-metadata">

**Author:** ![Kulkul](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.dynamobim.com/kulkul/32/49801_2.png) [@Kulkul](https://forum.dynamobim.com/u/Kulkul)\
**Post date:** [May 31, 2020, 1:06pm UTC](https://forum.dynamobim.com/t/all-element-of-category-errors/51246/4 "2020-05-31T13:06:40Z")

</div>

You need wall types to set compound layer. Use forum search to find many topics related to this. Below is one of them:

> [@Set family parameter \\"Material for model behavior\\"](https://forum.dynamobim.com/t/set-family-parameter-material-for-model-behavior/3032/2):
>
> Hi Dynamocando, There is a custom node from “Clockwork Package” called “FamilyType.SetCompoundLayerMaterial”. Try using that see if it helps. Below is an example of walls.

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