after hours of pissing around on the mac...gave up..so got this configured how i wanted in VS2015 now to see if it works on the mac

src/Ocelot.Library/Infrastructure/Responses/Error.cs

@@ -0,0 +1,12 @@
+namespace Ocelot.Library.Infrastructure.Responses
+{
+    public abstract class Error 
+    {
+        public Error(string message)
+        {
+            Message = message;
+        }
+
+        public string Message { get; private set; }
+    }
+}

src/Ocelot.Library/Infrastructure/Responses/ErrorResponse.cs

@@ -0,0 +1,11 @@
+using System.Collections.Generic;
+
+namespace Ocelot.Library.Infrastructure.Responses
+{
+    public class ErrorResponse : Response
+    {
+        public ErrorResponse(List<Error> errors) : base(errors)
+        {
+        }
+    }
+}

src/Ocelot.Library/Infrastructure/Responses/ErrorResponseGeneric.cs

@@ -0,0 +1,11 @@
+using System.Collections.Generic;
+
+namespace Ocelot.Library.Infrastructure.Responses
+{
+    public class ErrorResponse<T> : Response<T>
+    {
+        public ErrorResponse(List<Error> errors) : base(errors)
+        {
+        }
+    }
+}

src/Ocelot.Library/Infrastructure/Responses/OkResponse.cs

@@ -0,0 +1,9 @@
+namespace Ocelot.Library.Infrastructure.Responses
+{
+    public class OkResponse : Response
+    {
+        public OkResponse()
+        {
+        }
+    }
+}

src/Ocelot.Library/Infrastructure/Responses/OkResponseGeneric.cs

@@ -0,0 +1,9 @@
+namespace Ocelot.Library.Infrastructure.Responses
+{
+    public class OkResponse<T> : Response<T>
+    {
+        public OkResponse(T data) : base(data)
+        {
+        }
+    }
+}

src/Ocelot.Library/Infrastructure/Responses/Response.cs

@@ -0,0 +1,19 @@
+using System.Collections.Generic;
+
+namespace Ocelot.Library.Infrastructure.Responses
+{
+    public abstract class Response
+    {
+        protected Response()
+        {
+            Errors = new List<Error>();
+        }
+
+        protected Response(List<Error> errors)
+        {
+            Errors = errors ?? new List<Error>();
+        } 
+
+        public List<Error> Errors { get; private set; }
+    }
+}

src/Ocelot.Library/Infrastructure/Responses/ResponseGeneric.cs

@@ -0,0 +1,18 @@
+using System.Collections.Generic;
+
+namespace Ocelot.Library.Infrastructure.Responses
+{
+    public abstract class Response<T> : Response
+    {
+        protected Response(T data)
+        {
+            Data = data;
+        }
+
+        protected Response(List<Error> errors) : base(errors)
+        {
+        }
+
+        public T Data { get; private set; }
+    }
+}