ADOMDDataReader creates Exception "Parser: The statement dialect could not be resolved due to ambiguity."

Created an SQL Server 2016 Analysis Service Database named "SharePointTimeSlab" with Visual Studio Multidimensional Cube Development Project. Though I did not specifically created a cube in the project.

I created a mining structure with Time Series algorithm with a Key Time Input, a Time Slab input and a Predictable Hit Count Column. The resulting Analysis Server Database looks like this in Sql Server Management Studio:

Now here is the DMX query and the results are shown here.

Problem is, I created a Console C# Project, added the Microsoft.AnalysisServcies.AdoMdClient Reference and gave the following code:

static void Main(string[] args)
    {
        const string connectionString = "Data Source=devesql;Catalog=SharePointTimeSlab;Integrated Security=SSPI";

        using (var connection = new AdomdConnection(connectionString))
        {
            connection.Open();

            using (var cmd = new AdomdCommand("SELECT FLATTENED [Time Slab], PredictTimeSeries([Hit Count], 5) ON COLUMNS FROM [SPTS]", connection))
            {
                using (var reader = cmd.ExecuteReader())
                {
                    while(reader.Read())
                    {
                        var timeSlab = (string)reader[0];
                        var monthKey = (string)reader[1];
                        var hitCount = (int)reader[2];
                    }
                }
            }
        }
    }

Problem is, the reader=cmd.ExecuteReader Code is creating an exception. Here is the exception stacktrace:

Microsoft.AnalysisServices.AdomdClient.AdomdErrorResponseException
  HResult=0x80131500
  Message=Parser: The statement dialect could not be resolved due to 
  ambiguity.
  Source=Microsoft SQL Server 2016 Analysis Services
  StackTrace:
   at 

Microsoft.AnalysisServices.AdomdClient.AdomdConnection.XmlaClientProvider.Microsoft.AnalysisServices.AdomdClient.IExecuteProvider.ExecuteTabular(CommandBehavior behavior, ICommandContentProvider contentProvider, AdomdPropertyCollection commandProperties, IDataParameterCollection parameters) at Microsoft.AnalysisServices.AdomdClient.AdomdCommand.ExecuteReader(CommandBehavior behavior) at Microsoft.AnalysisServices.AdomdClient.AdomdCommand.ExecuteReader() at HelloDMXQuery.Program.Main(String[] args) in C:\Users\debkanti.afbl\source\repos\Data Mining\HelloDMXQuery\HelloDMXQuery\Program.cs:line 22

What did I do wrong?