NUnit 3 and Import External Test Report

I am using Visual Studio/NUnit (v3.2.1) to run test automation and HP ALM 12.20 for manual testing.  Whenver I have attempted to use the Import External Test Report function I get the error below.  I was wondering if there was a specific version of NUnit (e.g. 2.x) that it was expecting? 

System.Exception: Nonsupported Test Report.
   at HP.ALM.QC.UI.Modules.Shared.Core.ReportParser.ParseTestSets(FileStream reportInputStream)
   at HP.ALM.QC.UI.Modules.Shared.Services.GenerateFromTestReportService.ImportExternalTestSets(String report)
   at HP.ALM.QC.UI.Modules.Shared.Services.GenerateFromTestReportService.OnWizardFinished(Object sender, GenerateFromTestReportEventArgs e)
   at HP.ALM.QC.UI.Modules.Shared.Services.GenerateFromTestReportForm.OnFormClosing(FormClosingEventArgs e)
   at System.Windows.Forms.Form.CheckCloseDialog(Boolean closingOnly)

UPDATE:  I was able to verify that NUnit XML result 2.x import worked without any issue.  Anyone know if newer versions of ALM allow for NUnit 3.x XML result schema?