Column features must be of type org.apache.spark.ml.linalg.VectorUDT

I want to run this code in pyspark (spark 2.1.1):

from pyspark.ml.feature import PCA

bankPCA = PCA(k=3, inputCol="features", outputCol="pcaFeatures") 
pcaModel = bankPCA.fit(bankDf)    
pcaResult = pcaModel.transform(bankDF).select("label", "pcaFeatures")    
pcaResult.show(truncate= false)

But I get this error:

requirement failed: Column features must be of type org.apache.spark.ml.linalg.Vect orUDT@3bfc3ba7 but was actually org.apache.spark.mllib.linalg.VectorUDT@f71b0bce.