Receiving JSON object with a Web Service

Hi,

I am have a process that I need to offer as a Web Service with RapidMiner Server (1.3.015). This process has to receive a JSON object that I should transform in a example set. I have been trying to manage this scenario defining a macro to receive the JSON objet to use with Create document Operator and Json to XML Operator but I am obtening an error:

<error>
<service>ParsingJSON</service>
<type>
de.rapidanalytics.ejb.service.ServiceDataSourceException
</type>
<message>
Error executing process /home/admin/Prueba JSON/ParsingJSON for service ParsingJSON: The dummy operator Create Document (replacing text:create_document) cannot be executed.
</message>
</error>


The XML of the process is:


<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<process version="5.3.015">
  <context>
    <input/>
    <output/>
    <macros>
      <macro>
        <key>text</key>
        <value>{"IMEI":353234028103206,"P":"ID00001","TS":"11/11/12 08:31:44","IO1":1,"IO2":0,"IO3":1,"IO4":1,”IO5”:0,”IO6”:0,”IO7”:1,”IO8”:0,”IO9”:1,”IO10”:0,”AD1”:1250,”AD2”:1700}</value>
      </macro>
    </macros>
  </context>
  <operator activated="true" class="process" compatibility="5.3.015" expanded="true" name="Process">
    <parameter key="logverbosity" value="init"/>
    <parameter key="random_seed" value="2001"/>
    <parameter key="send_mail" value="never"/>
    <parameter key="notification_email" value=""/>
    <parameter key="process_duration_for_mail" value="30"/>
    <parameter key="encoding" value="SYSTEM"/>
    <parameter key="parallelize_main_process" value="false"/>
    <process expanded="true">
      <operator activated="true" class="text:create_document" compatibility="5.3.002" expanded="true" height="60" name="Create Document" width="90" x="179" y="75">
        <parameter key="text" value="%{text}"/>
        <parameter key="add label" value="true"/>
        <parameter key="label_type" value="nominal"/>
        <parameter key="label_value" value="json"/>
      </operator>
      <operator activated="true" class="web:json_to_xml" compatibility="5.3.001" expanded="true" height="60" name="Json to XML" width="90" x="313" y="75">
        <parameter key="enclosing_tag_name" value="json"/>
      </operator>
      <operator activated="true" class="read_xml" compatibility="5.3.015" expanded="true" height="60" name="Read XML" width="90" x="514" y="75">
        <parameter key="xpath_for_examples" value="&lt;json&gt;"/>
        <enumeration key="xpaths_for_attributes"/>
        <parameter key="use_namespaces" value="true"/>
        <list key="namespaces"/>
        <parameter key="use_default_namespace" value="true"/>
        <parameter key="parse_numbers" value="true"/>
        <parameter key="decimal_character" value="."/>
        <parameter key="grouped_digits" value="false"/>
        <parameter key="grouping_character" value=","/>
        <parameter key="date_format" value=""/>
        <list key="annotations"/>
        <parameter key="time_zone" value="SYSTEM"/>
        <parameter key="locale" value="English (United States)"/>
        <list key="data_set_meta_data_information"/>
        <parameter key="read_not_matching_values_as_missings" value="true"/>
        <parameter key="datamanagement" value="double_array"/>
      </operator>
      <connect from_op="Create Document" from_port="output" to_op="Json to XML" to_port="document"/>
      <connect from_op="Json to XML" from_port="document" to_op="Read XML" to_port="file"/>
      <portSpacing port="source_input 1" spacing="0"/>
      <portSpacing port="sink_result 1" spacing="0"/>
    </process>
  </operator>
</process>


Could you help me to understand why it is not working?

Best Regards, Alberto