# CAD.CurvesFromCADLayers - problem

**URL:** <https://forum.dynamobim.com/t/cad-curvesfromcadlayers-problem/43904>\
**Category:** Revit\
**Tags:** dynamo\
**Created:** [December 2, 2019, 3:42pm UTC](https://forum.dynamobim.com/t/cad-curvesfromcadlayers-problem/43904 "2019-12-02T15:42:00Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![skoupil6](https://avatars.discourse-cdn.com/v4/letter/s/d26b3c/32.png) [@skoupil6](https://forum.dynamobim.com/u/skoupil6)\
**Post date:** [December 2, 2019, 3:42pm UTC](https://forum.dynamobim.com/t/cad-curvesfromcadlayers-problem/43904/1 "2019-12-02T15:42:00Z")

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Hello  
I have a problem with BimorphNodes.

CAD. CurvesFromCADLayers problem: Warning: CAD.CurvesFromCADLayers - Operation failed.  
You cannot cast an Autodesk.Revit.DB.FamilyInstance type to an Autodesk.Revit.DB.ImportInstance type.

List.Flatten problem: Warning: List.Flatten - Operation failed.

BimorphNodes version is 3.0.3. Everything worked fine with the old version of BimorphNodes, i dont know the version. Today i had to download the new version of Rhythm and BimorphNodes because the old ones disappeared and i had a unresolved text on it.

 ![Script problem](https://us1.discourse-cdn.com/flex022/uploads/dynamobim/original/3X/d/e/de2b4b256c911ee7d9cccce9880afb8bb7ae7147.jpeg)[Import3d2Pipe.dyn](https://forum.dynamobim.com/uploads/short-url/krXA3vXYr7BviogIvtbIsPJ3ZPf.dyn) (29.0 KB)

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**Author:** ![Deniz\_Maral](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.dynamobim.com/deniz_maral/32/80323_2.png) [@Deniz\_Maral](https://forum.dynamobim.com/u/Deniz_Maral)\
**Post date:** [December 2, 2019, 4:23pm UTC](https://forum.dynamobim.com/t/cad-curvesfromcadlayers-problem/43904/2 "2019-12-02T16:23:23Z")

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Do you have the linked file as rvt or as dwg? You should have it as linked dwg. Otherwise would not work.

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**Author:** ![skoupil6](https://avatars.discourse-cdn.com/v4/letter/s/d26b3c/32.png) [@skoupil6](https://forum.dynamobim.com/u/skoupil6)\
**Post date:** [December 3, 2019, 7:17am UTC](https://forum.dynamobim.com/t/cad-curvesfromcadlayers-problem/43904/3 "2019-12-03T07:17:06Z")

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Hi,

Thank you so much.

Best regards

Skoupil Jakub