Solved: Error: Permission denied to access property "toString" <option id="text/css" > CSS</option>

Hi,
On load of my web page i see the following error in my FireBug console :

Error: Permission denied to access property "toString"
<option id="text/css" > CSS</option>

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what could be the reason for this ?

Jsp for the page :

<!DOCTYPE html>
<html>
  <head>
    <title>Create Snippet</title>

    <meta name="viewport" content="width=device-width,initial-scale=1,maximum-scale=1">
    <script>var require = {config: function (c) {require = c}}</script>

  </head>

  <body>
    <div id="container">
      <div class="dijitDialogTitleBar">
	<div class="dijitDialogTitle">Create Snippet</div>
      </div>
      <div class="dijitDialogPaneContent">
	<input id="name" type="text" class="title" placeholder="Title (Optional)" />
	<div class="form-group">
	  <select id="mode" class="form-control">
	    <option value="" disabled selected style='display:none;'>Code Type</option>
<option id="text/apl" > APL</option>
	    <option id="application/pgp" > PGP</option>
	    <option id="text/x-ttcn-asn" > ASN.1</option>
	    <option id="text/x-asterisk" > Asterisk</option>
	    <option id="text/x-csrc" > C</option>
	    <option id="text/x-c++src" > C++</option>
	    <option id="text/x-cobol" > Cobol</option>
	    <option id="text/x-csharp" > C#</option>
	    <option id="text/x-clojure" > Clojure</option>
	    <option id="text/x-cmake" > CMake</option>
	    <option id="text/x-coffeescript" > CoffeeScript</option>
	    <option id="text/x-common-lisp" > Common Lisp</option>
	    <option id="application/x-cypher-query" > Cypher</option>
	    <option id="text/x-cython" > Cython</option>
	    <option id="text/css" > CSS</option>
	    <option id="application/x-httpd-php" > PHP</option>
	    <option id="text/x-pig" > Pig</option>
	    <option id="text/plain" > Plain Text</option>
	    <option id="text/x-plsql" > PLSQL</option>
	    <option id="text/x-properties" > Properties files</option>
	    <option id="text/x-python" > Python</option>
	    <option id="text/x-puppet" > Puppet</option>
	    <option id="text/velocity" > Velocity</option>
	    <option id="text/x-verilog" > Verilog</option>
	    <option id="application/xml" > XML</option>
	    <option id="application/xquery" > XQuery</option>
	    <option id="text/x-yaml" > YAML</option>
	    <option id="text/x-z80" > Z80</option>
	  </select>
	</div>
	
	<div id="editor-pane">
	  <div id="editor"></div>
	</div>
	<div class="message_area">
	  <textarea id="message" type="text" placeholder="Add Comment (Optional)" ></textarea>
	</div>
	<div class="buttons">
	  <button id="submit" class="btn_green">Create & Post</button>
	  <button class="dailogueCancel" id="cancel">Cancel</button>
	</div>
      </div>
    </div>
    <div class="invisible" data-create-url="${createURL}"></div>
  </body>
</html>

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Following js is also included in the page :

require(["jquery", "detect", "utils", "codemirror/lib/codemirror", "codemirror/mode/meta", "codemirror/addon/mode/loadmode", "codemirror/addon/selection/active-line"], function ($, detect, utils, CodeMirror) {

    CodeMirror.modeURL = "codemirror/mode/%N/%N";

    var cm = window.cm = CodeMirror($('#editor').get(0), {
        styleActiveLine: true,
        lineNumbers: !detect.isMobile,
    });

    var mime;
    $("#mode").on("change", function() {
        mime = $("#mode option:selected").prop("id");
        var mode = CodeMirror.findModeByMIME(mime).mode;
        cm.setOption("mode", mode);
        CodeMirror.autoLoadMode(cm, mode);
    });

    $("#submit").on("click", function(e) {               // on submtting make the editor readonly
        //alert($("#name").value());
        e.preventDefault();
        e.stopPropagation();

        var objectTobeSent = {};
        objectTobeSent.id = null;
        objectTobeSent.title = $("#name").val();
        if (objectTobeSent.title === "") {
            objectTobeSent.title = "Untitled";
        } 
        objectTobeSent.mime = mime;//console.log(objectTobeSent.mode);
        objectTobeSent.text = cm.getValue();

        var createURL = document.getElementsByClassName("invisible")[0].dataset.createUrl;

        $.ajax({
            contentType: "application/json; charset=utf-8",
            url : createURL,
            type: "POST",
            data : JSON.stringify(objectTobeSent),
            success: function(snippet, status, xhr) {
                if (xhr.status !== 201) {
                    alert("Couldn't create code snippet. Please try after sometime");
                } else if (!utils.sendMessage(snippet, objectTobeSent.title, $("#message").val())) {
                    window.location.href = snippet.URL;
                }
            },
            error: function(request, status, error) {
                alert(request.responseText);
            }
        });
    });

    $("#cancel").on("click", function (e) {
    });
});

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What could be the reason for this error ? How do i correct it ?
Thanks

Error: Permission denied to access property &quot;toString&quot; &lt;option id=&quot;text/css&quot; &gt; CSS&lt;/option&gt;

Error: Permission denied to access property "toString" <option id="text/css" > CSS</option>