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HomeHomeUsing DNN Platf...Using DNN Platf...Administration ...Administration ...Cannot add existing module to pageCannot add existing module to page
New Post
10/18/2013 5:42 AM

I have a problem adding an existing module to a page.  

I click 'Add Existing Module', get the message 'To Get Started, Please Select Site and Page First'.  I then hit the arrow n the '<None Specified>' box.  The area drops down with the rotating wheel.  Unfortunately the wheel just keeps rotating and the list is not populated.  

I have tried in both IE and Chrome.  I'm using DNN 07.01.02 and the Dark Knight Skin.

New Post
10/18/2013 7:37 AM


Can you open the browser developer tools in the console tab to see if there are some javascript errors ?



New Post
10/18/2013 8:09 AM

Thanks for replying. There are some errors:

Webpage error details

User Agent: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.2; WOW64; Trident/6.0; .NET4.0E; .NET4.0C; .NET CLR 1.1.4322; .NET CLR 3.5.30729; .NET CLR 2.0.50727; .NET CLR 3.0.30729; InfoPath.3; BRI/2)
Timestamp: Fri, 18 Oct 2013 12:08:29 UTC

Message: Unable to get property 'length' of undefined or null reference
Line: 588
Char: 25
Code: 0

New Post
10/19/2013 6:06 AM
Looks to me as there are any issue with a module on the page that using some JavaScript and is not compatible with the jQuery 1.9.1 and jQueryUI 1.10.3. I am not sure if the darkNight Skin using JavaScript in ist code, you should check this too.
New Post
10/19/2013 7:16 AM
Thanks for the suggestion Matthias.

I did try deleting some of the Dark Knight scripts (and while they messed up the menu, it did not solve the problem).

Using the IE debugger, I have some more information:

TreeNodeConverter.castNode = function(model) {
if (!model) {
return null;
var castedNode = TreeNodeConverter.createNodeFromModel(;
for (var i = 0, count = model.children.length; i < count; i++) {
return castedNode;

SCRIPT5007: Unable to get property 'length' of undefined or null reference
dnn.dropdownlist.js, line 588 character 25
... this is in the 'model.children.length' statement

I need some suggestions on how to go forward from here.

HomeHomeUsing DNN Platf...Using DNN Platf...Administration ...Administration ...Cannot add existing module to pageCannot add existing module to page

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