OperationCanceledException adding generated items

[pepone]

System.OperationCanceledException: The operation was canceled.
   at System.Runtime.InteropServices.Marshal.ThrowExceptionForHRInternal(Int32 errorCode, IntPtr errorInfo)
   at Microsoft.VisualStudio.ErrorHandler.ThrowOnFailure(Int32 hr)
   at IceBuilder.IVsProjectExtension.GetProjectItem(IVsProject project, String path)
   at IceBuilder.ProjectUtil.TryAddItem(IVsProject project, String path) in D:\3.7\ice-builder-visualstudio-2019-2\IceBuilder\ProjectUtil.cs:line 248
   at IceBuilder.ProjectUtil.AddCSharpGeneratedItem(IVsProject project, Project dteproject, String projectDir, String path, String generatedpath) in D:\3.7\ice-builder-visualstudio-2019-2\IceBuilder\ProjectUtil.cs:line 422
   at IceBuilder.ProjectUtil.AddCSharpGeneratedFiles(IVsProject project, String file) in D:\3.7\ice-builder-visualstudio-2019-2\IceBuilder\ProjectUtil.cs:line 319
   at IceBuilder.ProjectUtil.AddGeneratedFiles(IVsProject project, String file) in D:\3.7\ice-builder-visualstudio-2019-2\IceBuilder\ProjectUtil.cs:line 283
   at IceBuilder.DocumentEventHandler.OnAfterAddFilesEx(Int32 projectsLength, Int32 filesLength, IVsProject[] projects, Int32[] indices, String[] names, VSADDFILEFLAGS[] rgFlags) in D:\3.7\ice-builder-visualstudio-2019-2\IceBuilder\DocumentEventHandler.cs:line 209