Regarding sampling files from a given folder and saving them into another one

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edited November 5 in Community Q&A
Hi,    I am trying to build a workflow that can sample a certain number of documents saved in a directory and put these sampled files into another directory.

I started with the following process to test the sampler opertor at first. However, the error message is like " the exampleset must contain at least 10 examples" although the input folder has more than 200 files.

In addition, I could not find the operator that can save files into a given folder. Are there any examples for this kind of functionality? Thanks a lot.

Here is the workflow I tried 
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<process version="5.2.008">
  <context>
    <input/>
    <output/>
    <macros/>
  </context>
  <operator activated="true" class="process" compatibility="5.2.008" expanded="true" name="Process">
    <process expanded="true" height="296" width="547">
      <operator activated="true" class="text:process_document_from_file" compatibility="5.2.004" expanded="true" height="76" name="Process Documents from Files" width="90" x="96" y="104">
        <list key="text_directories">
          <parameter key="R" value="C:\Users\Desktop\testdata"/>
        </list>
        <process expanded="true">
          <portSpacing port="source_document" spacing="0"/>
          <portSpacing port="sink_document 1" spacing="0"/>
        </process>
      </operator>
      <operator activated="true" class="sample" compatibility="5.2.008" expanded="true" height="76" name="Sample" width="90" x="380" y="210">
        <parameter key="sample_size" value="10"/>
        <list key="sample_size_per_class"/>
        <list key="sample_ratio_per_class"/>
        <list key="sample_probability_per_class"/>
      </operator>
      <connect from_op="Process Documents from Files" from_port="example set" to_op="Sample" to_port="example set input"/>
      <portSpacing port="source_input 1" spacing="0"/>
      <portSpacing port="sink_result 1" spacing="0"/>
    </process>
  </operator>
</process>
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