title: Schema mismatch for feature column 'Features':
body: <p>Schema mismatch for feature column 'Features': expected Vector, got Vector Parameter name: inputSchema
  That error occur on following code</p>
  
  <pre><code> static readonly string _dataPat=Path.Combine(Environment.CurrentDirectory, "Data", "train_data.csv"); 
  static void Main(string[] args)
      {
  
              var mlContext = new MLContext(seed: 0);
  
          IDataView data = mlContext.Data.LoadFromTextFile&lt;IrisData&gt;(_dataPath, separatorChar: ',', hasHeader: true);
  
          string featuresColumnName = "Features";
  
              var pipeline = mlContext.Transforms
                  .Concatenate(featuresColumnName,"Class", "Sex", "AgeGroup", "Embarked")
                  .Append(mlContext.Clustering.Trainers.KMeans(featuresColumnName, numberOfClusters: 2));
  
              var model = pipeline.Fit(data);
  </code></pre>
  
  <p>Error is on line with Code</p>
  
  <pre><code>var model = pipeline.Fit(data);
  </code></pre>
  
  <p>my class IrisData</p>
  
  <pre><code>public class IrisData
  {
      [LoadColumn(0)]
      public string Class;
  
      [LoadColumn(1)]
      public string Sex;
  
      [LoadColumn(2)]
      public string AgeGroup;
  
      [LoadColumn(3)]
      public string Embarked;
  }
  </code></pre>
  
  <p><a href="https://i.stack.imgur.com/A6GnD.png" rel="nofollow noreferrer">CSV file in my project</a></p>