Build error for a revit plugin

[balachandar_vVF4MG]

a revit plugin build for revit 2020 version which is migrated to 2025 , getting this error while building the solution. Someone kindly help me to sort out this error 

Unknown build error, 'Could not load type 'System.Security.SecurityRulesAttribute' from assembly 'System.Runtime, Version=4.1.2.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'.'	SWS_MODRENUI

[Mohamed_Arshad]

Hi @balachandar_vVF4MG 

Please share your project, or compare your csproj with attached project.

RibbonBimStarter/RibbonBimStarter/RibbonBimStarter.csproj at palette2 · Tereami/RibbonBimStarter · G...

Hope this will Help 🙂

[TripleM-Dev.net · Accepted solution]

Try removing the reference and adding it from .NET Core 8 available assemblies.

Maybe wrong version (references 4.1.2.0 for System.Runtime, thats I think the .NET Framework version)