Error for Process Documents from Files

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Hi all and Happy New Year,

I have a html file in the operator Process Documents from Files , which is causing following error:

Process failed.

The name ... (some japanese characters) is not legal for JDOM/XML attributes: XML names cannot contain the character "c" (looks like c...).

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<process version="5.3.013">
  <context>
    <input/>
    <output/>
    <macros/>
  </context>
  <operator activated="true" class="process" compatibility="5.3.013" expanded="true" name="Process">
    <process expanded="true">
      <operator activated="true" class="text:process_document_from_file" compatibility="5.3.002" expanded="true" height="76" name="Process Documents from Files (2)" width="90" x="112" y="30">
        <list key="text_directories">
          <parameter key="testhtml" value="/home/nick/Documents/RapidMinerTest/allhtml"/>
        </list>
        <parameter key="file_pattern" value="*.html"/>
        <parameter key="encoding" value="UTF-8"/>
        <parameter key="vector_creation" value="Term Occurrences"/>
        <parameter key="keep_text" value="true"/>
        <process expanded="true">
          <operator activated="true" class="web:extract_html_text_content" compatibility="5.3.001" expanded="true" height="60" name="Extract Content" width="90" x="45" y="30">
            <parameter key="minimum_text_block_length" value="3"/>
          </operator>
          <operator activated="true" class="text:tokenize" compatibility="5.3.002" expanded="true" height="60" name="Tokenize (2)" width="90" x="179" y="30"/>
          <operator activated="true" class="text:filter_by_length" compatibility="5.3.002" expanded="true" height="60" name="Filter Tokens (2)" width="90" x="313" y="30">
            <parameter key="min_chars" value="3"/>
            <parameter key="max_chars" value="30"/>
          </operator>
          <operator activated="true" class="text:transform_cases" compatibility="5.3.002" expanded="true" height="60" name="Transform Cases (2)" width="90" x="447" y="30"/>
          <operator activated="true" class="text:filter_stopwords_english" compatibility="5.3.002" expanded="true" height="60" name="Filter Stopwords (2)" width="90" x="581" y="30"/>
          <connect from_port="document" to_op="Extract Content" to_port="document"/>
          <connect from_op="Extract Content" from_port="document" to_op="Tokenize (2)" to_port="document"/>
          <connect from_op="Tokenize (2)" from_port="document" to_op="Filter Tokens (2)" to_port="document"/>
          <connect from_op="Filter Tokens (2)" from_port="document" to_op="Transform Cases (2)" to_port="document"/>
          <connect from_op="Transform Cases (2)" from_port="document" to_op="Filter Stopwords (2)" to_port="document"/>
          <connect from_op="Filter Stopwords (2)" from_port="document" to_port="document 1"/>
          <portSpacing port="source_document" spacing="0"/>
          <portSpacing port="sink_document 1" spacing="0"/>
          <portSpacing port="sink_document 2" spacing="0"/>
        </process>
      </operator>
      <connect from_op="Process Documents from Files (2)" from_port="example set" to_port="result 2"/>
      <connect from_op="Process Documents from Files (2)" from_port="word list" 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"/>
      <portSpacing port="sink_result 3" spacing="0"/>
    </process>
  </operator>
</process>

Any ideas?

Thanks in advance.