Read Sparse and the Label Attribute

Hello!

I am trying to create a Decision Tree with Rapidminer and followed a Video Tutorial.

My problem is to use "Read Sparse" as input... I am getting an error because the input example set must have the special attribute 'label' although i do have a label in the data view.

For testing purposes I used data in this form:
Yes 1:15
No 1:25
No 1:26
Yes 1:12

And here the XML-Code

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<process version="5.1.017">
  <context>
    <input/>
    <output/>
    <macros/>
  </context>
  <operator activated="true" class="process" compatibility="5.1.017" expanded="true" name="Process">
    <process expanded="true" height="663" width="1094">
      <operator activated="true" class="read_sparse" compatibility="5.1.017" expanded="true" height="60" name="Read Sparse" width="90" x="179" y="120">
        <parameter key="data_file" value="C:\Users\sWn\Desktop\myTxt.txt"/>
        <parameter key="dimension" value="1"/>
        <parameter key="use_quotes" value="false"/>
        <list key="prefix_map"/>
      </operator>
      <operator activated="true" class="split_validation" compatibility="5.1.017" expanded="true" height="112" name="Validation" width="90" x="447" y="120">
        <process expanded="true" height="645" width="502">
          <operator activated="true" class="decision_tree" compatibility="5.1.017" expanded="true" height="76" name="Decision Tree" width="90" x="179" y="30"/>
          <connect from_port="training" to_op="Decision Tree" to_port="training set"/>
          <connect from_op="Decision Tree" from_port="model" to_port="model"/>
          <portSpacing port="source_training" spacing="0"/>
          <portSpacing port="sink_model" spacing="0"/>
          <portSpacing port="sink_through 1" spacing="0"/>
        </process>
        <process expanded="true" height="645" width="502">
          <operator activated="true" class="apply_model" compatibility="5.1.017" expanded="true" height="76" name="Apply Model" width="90" x="112" y="30">
            <list key="application_parameters"/>
          </operator>
          <operator activated="true" class="performance" compatibility="5.1.017" expanded="true" height="76" name="Performance" width="90" x="313" y="30"/>
          <connect from_port="model" to_op="Apply Model" to_port="model"/>
          <connect from_port="test set" to_op="Apply Model" to_port="unlabelled data"/>
          <connect from_op="Apply Model" from_port="labelled data" to_op="Performance" to_port="labelled data"/>
          <connect from_op="Performance" from_port="performance" to_port="averagable 1"/>
          <portSpacing port="source_model" spacing="0"/>
          <portSpacing port="source_test set" spacing="0"/>
          <portSpacing port="source_through 1" spacing="0"/>
          <portSpacing port="sink_averagable 1" spacing="0"/>
          <portSpacing port="sink_averagable 2" spacing="0"/>
        </process>
      </operator>
      <connect from_op="Read Sparse" from_port="output" to_op="Validation" to_port="training"/>
      <connect from_op="Validation" from_port="training" to_port="result 1"/>
      <connect from_op="Validation" from_port="averagable 1" to_port="result 2"/>
      <portSpacing port="source_input 1" spacing="0"/>
      <portSpacing port="sink_result 1" spacing="90"/>
      <portSpacing port="sink_result 2" spacing="0"/>
      <portSpacing port="sink_result 3" spacing="0"/>
    </process>
  </operator>
</process>

What am I doing wrong?