# Create walls on the room boundary

**URL:** <https://forum.dynamobim.com/t/create-walls-on-the-room-boundary/61554>\
**Category:** Revit\
**Tags:** dynamo\
**Created:** [March 14, 2021, 7:21pm UTC](https://forum.dynamobim.com/t/create-walls-on-the-room-boundary/61554 "2021-03-14T19:21:44Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![nunojpinto](https://avatars.discourse-cdn.com/v4/letter/n/b487fb/32.png) [@nunojpinto](https://forum.dynamobim.com/u/nunojpinto)\
**Post date:** [March 14, 2021, 7:21pm UTC](https://forum.dynamobim.com/t/create-walls-on-the-room-boundary/61554/1 "2021-03-14T19:21:44Z")

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Hi everyone!

I started the frist steps in Dynamo and I would like to create walls through room boundary, but when I run there is warning like

 ![DIMS_Algorithm_CreateWallsfromRoomBoundary](https://us1.discourse-cdn.com/flex022/uploads/dynamobim/original/3X/b/a/ba4fa40a9550d068b52620556dc1470e50482126.png)

any tip? Thanks

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**Author:** ![Hamish](https://avatars.discourse-cdn.com/v4/letter/h/a5b964/32.png) [@Hamish](https://forum.dynamobim.com/u/Hamish)\
**Post date:** [March 14, 2021, 7:38pm UTC](https://forum.dynamobim.com/t/create-walls-on-the-room-boundary/61554/2 "2021-03-14T19:38:17Z")

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You’ll have to show the dropdowns of the inputs/outputs for those problematic nodes, displaying the error for them would help as well.

At a guess, your ‘Wall Finish’ parameter string isn’t matching a wall type for the WallType.ByName node.

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**Author:** ![nunojpinto](https://avatars.discourse-cdn.com/v4/letter/n/b487fb/32.png) [@nunojpinto](https://forum.dynamobim.com/u/nunojpinto)\
**Post date:** [March 14, 2021, 11:17pm UTC](https://forum.dynamobim.com/t/create-walls-on-the-room-boundary/61554/3 "2021-03-14T23:17:36Z")

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Thanks a lot!

I send the file and the image with the warning

 ![M3_exe_03](https://us1.discourse-cdn.com/flex022/uploads/dynamobim/original/3X/f/0/f0065c177fbefe3aad48d9a6c4cf9e52b41bcb5f.png)

[CreateWallsfromRoomBoundary.dyn](https://forum.dynamobim.com/uploads/short-url/32Y55dmnz5ybUMgPlYPPr4fPL7P.dyn) (26.4 KB)

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<div class="post-metadata">

**Author:** ![Hamish](https://avatars.discourse-cdn.com/v4/letter/h/a5b964/32.png) [@Hamish](https://forum.dynamobim.com/u/Hamish)\
**Post date:** [March 14, 2021, 11:21pm UTC](https://forum.dynamobim.com/t/create-walls-on-the-room-boundary/61554/4 "2021-03-14T23:21:41Z")

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Yep, it is what I thought.

You’re getting a string ‘PA’ from your parameter. The WallType node is then looking for a wall type with the name ‘PA’ and not finding one. You need to create a wall type called ‘PA’, or enter a full type name of a wall type in your project as your ‘Wall Finish’ parameter.

Alternatively, if ‘PA’ is your keynote/type mark, you could get all wall types in the project, get their keynotes/type marks, find the one that matches your parameter code, then feed that into the wall creation node.

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<div class="post-metadata">

**Author:** ![nunojpinto](https://avatars.discourse-cdn.com/v4/letter/n/b487fb/32.png) [@nunojpinto](https://forum.dynamobim.com/u/nunojpinto)\
**Post date:** [March 14, 2021, 11:47pm UTC](https://forum.dynamobim.com/t/create-walls-on-the-room-boundary/61554/5 "2021-03-14T23:47:10Z")

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I will try, thanks