[SOLVED] Error executing background job 'Creating Display'

Hi all,

I've looked around the forum a bit , but I couldn't figure out a definitve solution to this problem.
Everytime I try to load in an Excel or a CSV file I get the following error. This error does not occur when I use tutorial data provided with RapidMiner.
An additional note, I have been working with the data set all day, but for some reason it quit on me 2 hours ago. Reinstalling did not solve anything (I guess because the uninstaller does not clear everything, since I did not have to reinstall any extensions)

Error:

Exception:	java.util.EmptyStackException
Message:	null
Stack trace:
  java.util.Stack.peek(Unknown Source)
  javax.swing.text.DefaultStyledDocument$ElementBuffer.insertElement(Unknown Source)
  javax.swing.text.DefaultStyledDocument$ElementBuffer.insertUpdate(Unknown Source)
  javax.swing.text.DefaultStyledDocument$ElementBuffer.insert(Unknown Source)
  javax.swing.text.DefaultStyledDocument.insert(Unknown Source)
  javax.swing.text.html.HTMLDocument.insert(Unknown Source)
  javax.swing.text.html.HTMLDocument$HTMLReader.flushBuffer(Unknown Source)
  javax.swing.text.html.HTMLDocument$HTMLReader.flush(Unknown Source)
  javax.swing.text.html.HTMLEditorKit.read(Unknown Source)
  javax.swing.JEditorPane.setText(Unknown Source)
  javax.swing.JEditorPane.<init>(Unknown Source)
  com.rapidminer.gui.tools.ExtendedHTMLJEditorPane.<init>(ExtendedHTMLJEditorPane.java:53)
  com.rapidminer.gui.processeditor.results.SingleResultOverview.makeMainLabel(SingleResultOverview.java:262)
  com.rapidminer.gui.processeditor.results.SingleResultOverview.<init>(SingleResultOverview.java:152)
  com.rapidminer.gui.processeditor.results.ProcessExecutionResultOverview.<init>(ProcessExecutionResultOverview.java:167)
  com.rapidminer.gui.processeditor.results.ResultOverview.addResults(ResultOverview.java:117)
  com.rapidminer.gui.processeditor.results.DockableResultDisplay$4.run(DockableResultDisplay.java:191)
  com.rapidminer.gui.tools.ProgressThread$2.run(ProgressThread.java:189)
  java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)
  java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
  java.lang.Thread.run(Unknown Source)

And the project:

<?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="235" width="145">
      <operator activated="true" class="read_csv" compatibility="5.2.008" expanded="true" height="60" name="Read CSV" width="90" x="80" y="145">
        <parameter key="csv_file" value="D:\Downloads\aai Pharma.csv"/>
        <parameter key="column_separators" value=","/>
        <parameter key="use_quotes" value="false"/>
        <parameter key="first_row_as_names" value="false"/>
        <list key="annotations"/>
        <parameter key="encoding" value="windows-1252"/>
        <list key="data_set_meta_data_information">
          <parameter key="0" value="att1.true.binominal.attribute"/>
          <parameter key="1" value="att2.true.polynominal.attribute"/>
          <parameter key="2" value="att3.true.polynominal.attribute"/>
          <parameter key="3" value="att4.false.polynominal.attribute"/>
          <parameter key="4" value="att5.false.polynominal.attribute"/>
          <parameter key="5" value="att6.true.polynominal.attribute"/>
          <parameter key="6" value="att7.true.polynominal.attribute"/>
        </list>
      </operator>
      <connect from_op="Read CSV" from_port="output" 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 for any help offered!