"Impute missing values using a saved model"

Hello,

I am trying to impute missing values using knn learner.  I am working with a large dataset and saved the model.  Now, I want to use the saved model for new (unseen) data in the impute operator.  This is because the new data is a much smaller sample size.  Unfortunately, I cannot get the saved model to impute the dataset.  Can someone please help me.  Here is what I am trying to do but does not work:

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<process version="5.3.008">
  <context>
    <input/>
    <output/>
    <macros/>
  </context>
  <operator activated="true" class="process" compatibility="5.3.008" expanded="true" name="Process">
    <process expanded="true">
      <operator activated="true" breakpoints="after" class="retrieve" compatibility="5.3.008" expanded="true" height="60" name="Labor-Negotiations" width="90" x="313" y="30">
        <parameter key="repository_entry" value="//Samples/data/Labor-Negotiations"/>
      </operator>
      <operator activated="true" breakpoints="after" class="impute_missing_values" compatibility="5.3.008" expanded="true" height="60" name="Impute Missing Values" width="90" x="514" y="30">
        <process expanded="true">
          <operator activated="true" class="read_model" compatibility="5.3.008" expanded="true" height="60" name="Read Model" width="90" x="246" y="30">
            <parameter key="model_file" value="C:\Users\John Richardson\Desktop\test"/>
          </operator>
          <operator activated="true" class="apply_model" compatibility="5.3.008" expanded="true" height="76" name="Apply Model" width="90" x="380" y="165">
            <list key="application_parameters"/>
          </operator>
          <connect from_port="example set source" to_op="Apply Model" to_port="unlabelled data"/>
          <connect from_op="Read Model" from_port="output" to_op="Apply Model" to_port="model"/>
          <connect from_op="Apply Model" from_port="model" to_port="model sink"/>
          <portSpacing port="source_example set source" spacing="0"/>
          <portSpacing port="sink_model sink" spacing="0"/>
        </process>
      </operator>
      <connect from_op="Labor-Negotiations" from_port="output" to_op="Impute Missing Values" to_port="example set in"/>
      <connect from_op="Impute Missing Values" from_port="example set out" to_port="result 1"/>
      <portSpacing port="source_input 1" spacing="0"/>
      <portSpacing port="sink_result 1" spacing="0"/>
      <portSpacing port="sink_result 2" spacing="0"/>
    </process>
  </operator>
</process>

Thanks in advance!
John