net.sourceforge.htmlunit.corejs.javascript.EcmaError: TypeError: Cannot read property "unload" from null (http://code.jquery.com/jquery-1.4.2.js#1919)

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Root Cause Analysis

  1. net.sourceforge.htmlunit.corejs.javascript.EcmaError

    TypeError: Cannot read property "unload" from null (http://code.jquery.com/jquery-1.4.2.js#1919)

    at net.sourceforge.htmlunit.corejs.javascript.ScriptRuntime.constructError()
  2. HtmlUnit Core JS
    Interpreter.interpretLoop
    1. net.sourceforge.htmlunit.corejs.javascript.ScriptRuntime.constructError(ScriptRuntime.java:3772)
    2. net.sourceforge.htmlunit.corejs.javascript.ScriptRuntime.constructError(ScriptRuntime.java:3750)
    3. net.sourceforge.htmlunit.corejs.javascript.ScriptRuntime.typeError(ScriptRuntime.java:3778)
    4. net.sourceforge.htmlunit.corejs.javascript.ScriptRuntime.typeError2(ScriptRuntime.java:3797)
    5. net.sourceforge.htmlunit.corejs.javascript.ScriptRuntime.undefReadError(ScriptRuntime.java:3810)
    6. net.sourceforge.htmlunit.corejs.javascript.ScriptRuntime.getObjectElem(ScriptRuntime.java:1439)
    7. net.sourceforge.htmlunit.corejs.javascript.Interpreter.interpretLoop(Interpreter.java:1429)
    7 frames