You are removing an element from the group which is involved in a sketch or family constraint with another element of the same group.
Either remove the constraint or cancel the removal of this element from the group.
Namespace:
Autodesk.Revit.DB
Assembly:
RevitAPI
(in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0)
Syntax
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