Troubleshooting issues preventing R.NET from finding R paths on Windows


An unhandled exception of type 'System.NotSupportedException' occurred in RDotNet.NativeLibrary.dll
Additional information: R_HOME was not provided and a suitable path could not be found by R.NET



For R.NET 1.6.5 or later, it is possible to get a log of the discovery process of the R paths.

The following program, also present in R.NET onboarding - ReportInfo, is useful to diagnose and report issues.

using System;
using RDotNet.NativeLibrary;

namespace ReportInfo
    class Program
        static void Main(string[] args)
            string rHome = null;
            string rPath = null;
            if (args.Length > 0)
                rPath = args[0];
            if (args.Length > 1)
                rHome = args[1];

            var logInfo = NativeUtility.FindRPaths(ref rPath, ref rHome);

            Console.WriteLine("Is this process 64 bits? {0}", System.Environment.Is64BitProcess);