Отключить вывод сообщений при повторной загрузке сборки:
addinmanagerlast Cannot load assembly. Error details: Autodesk.AutoCAD.Runtime.Exception: eDuplicateKey
at Autodesk.AutoCAD.Runtime.CommandClass.AddCommand(ICommandLineCallable ca, MethodInfo mi)
at Autodesk.AutoCAD.ApplicationServices.AutoCADApplicationHolder.Initialize(Assembly assembly)
at Autodesk.AutoCAD.ApplicationServices.ExtensionLoader.ProcessAssembly(Assembly assembly)
Сборка обновлена -