ArcGIS Pro 2.1 API Reference Guide
ConstructedOnWrongThreadException Class
Members 

ArcGIS.Core Namespace : ConstructedOnWrongThreadException Class
Thrown when a fine-grained object is being created on the wrong Pro thread
Syntax
Remarks
Usually this means an object that needs to be created on the Pro background thread is, instead, trying to be created from the UI
Inheritance Hierarchy

System.Object
   System.Exception
      ArcGIS.Core.ConstructedOnWrongThreadException

Requirements

Target Platforms:Windows 10, Windows 8.1, Windows 7

See Also

Reference

ConstructedOnWrongThreadException Members
ArcGIS.Core Namespace