Fixed PackExcelAddIn error DNA-818471385: Exception: System.IO.FileLoadException: Could not load file or assembly Microsoft.Bcl.AsyncInterfaces

When I built my Windows desktop C# project, I encountered some failures related to ExcelDna.AddIn (error DNA-818471385). Here is the sample error message. Solution Add reference “Microsoft.Bcl.AsyncInterfaces” on project that have ExcelDna.AddIn reference like this sample csproj below








