# Parameter.GetValue node failing

**URL:** <https://forum.dynamobim.com/t/parameter-getvalue-node-failing/72608>\
**Category:** Uncategorized\
**Created:** [January 25, 2022, 12:51pm UTC](https://forum.dynamobim.com/t/parameter-getvalue-node-failing/72608 "2022-01-25T12:51:32Z")\
**Posts on this page:** 1\
**Showing post:** 14

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**Author:** ![SeanP](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.dynamobim.com/seanp/32/42560_2.png) [@SeanP](https://forum.dynamobim.com/u/SeanP)\
**Post date:** [January 31, 2022, 11:17am UTC](https://forum.dynamobim.com/t/parameter-getvalue-node-failing/72608/14 "2022-01-31T11:17:39Z")

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May start here and see if you can work it to do what you want.

> [@Open Families from a Directory, Purge a Category, Load and Save](https://forum.dynamobim.com/t/open-families-from-a-directory-purge-a-category-load-and-save/26577):
>
> The following graph will load a family from a directory, delete all unused Family and Family Types of a Category, then Save and/or Load the family into the current project. Here is the core code in the “Open Document & Clean” node: import System import clr clr.AddReference("RevitNodes") import Revit clr.AddReference('RevitAPI') from Autodesk.Revit.DB import \* clr.AddReference('RevitServices') import R…

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