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Got this fixed. For those facing similar issue: expand the "References", find the ESRI.ArcGIS.Display reference. Right click it and select properties, and change "Embed Interop Types" to false.
It is not possible to use Esri Addins, regardless of whether you are using Python Addins or .NET Addins, to extend a custom application. You can only use Esri Addins to extend ArcGIS for Desktop applications (ArcMap, ArcCatalog, ArcScene, ArcGlobe). The error you are receiving is likely the result of your target name and/or version value not being a legal ...
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