title: Getting AttributeError: 'OneHotEncoder' object has no attribute '_jdf in pyspark'
body: <p>I am trying to implement Gradient boosting algorithm on a kaggle dataset in pyspark for learning purpose. I am facing  error given below </p>
  
  <pre><code>Traceback (most recent call last):
    File "C:/SparkCourse/Gradientboost.py", line 29, in &lt;module&gt;
      output=assembler.transform(data)
    File "C:\spark\python\lib\pyspark.zip\pyspark\ml\base.py", line 105, in transform
    File "C:\spark\python\lib\pyspark.zip\pyspark\ml\wrapper.py", line 281, in _transform
  AttributeError: 'OneHotEncoder' object has no attribute '_jdf'
  </code></pre>
  
  <p>the corresponding code is </p>
  
  <pre><code>from pyspark.sql import SparkSession
  from pyspark.ml.feature import StringIndexer,VectorIndexer,OneHotEncoder,VectorAssembler
  
  
  
  
  
  spark=SparkSession.builder.config("spark.sql.warehouse.dir", "file:///C:/temp").appName("Gradientboostapp").enableHiveSupport().getOrCreate()
  data= spark.read.csv("C:/Users/codemen/Desktop/Timeseries Analytics/liver_patient.csv",header=True, inferSchema=True)
  #data.show()
  print(data.count())
  #data.printSchema()
  print("After deleting  null  values")
  
  data=data.na.drop()
  print(data.count())
  
  data=StringIndexer(inputCol="Gender",outputCol="GenderIndex").fit(data)
  
  
  #let onehot encode the data
  
  data=OneHotEncoder(inputCol="GenderIndex",outputCol="gendervec")
  
  
  usedfeature=["Age","gendervec","Total_Bilirubin","Direct_Bilirubin","Alkaline_Phosphotase","Alamine_Aminotransferase","Aspartate_Aminotransferase","Total_Protiens","Albumin","Albumin_and_Globulin_Ratio"]
  #
  assembler=VectorAssembler(inputCols=usedfeature,outputCol="features")
  output=assembler.transform(data)
  output.select("features","category").show()
  </code></pre>
  
  <p>I have converted  Gender category into numerical form by using String indexer then I have tried to perform OnehotEncoding on Genderindex value. I am getting the error when I have performed VectorAssembler in code. May I am missing very silly concept here. kindly help me to figure it out </p>