Check out this issue on the Issue Tracker: http://issues.umbraco.org/issue/U4-9442

Hi Dan,

Thank you for reply.

Actually before posting this error I had tried almost all suggestions provided by other users here.

But still getting this issue.

I think I've missed something in Umbraco update.

Any idea?

It would help to know a bit more about your site. Do you have multiple root nodes, for instance?

Have you tried setting values for:

<add key="umbracoHideTopLevelNodeFromPath" value="true" />
<add key="umbracoUseDirectoryUrls" value="true" />

?

Currently value for both keys are 'true'.

<add key="umbracoHideTopLevelNodeFromPath" value="true" />
<add key="umbracoUseDirectoryUrls" value="true" />

And I've 1 root node and many sub nodes. It's looking like:

Home
    State
        Program
    District
        Program

Hmm, strange, I've never seen it happen with just one root site.

It generally happens when Umbraco strips out all the unwanted characters for URLs and then ends up with two exact same URLs. For instance, say you had the following two tree:

Home
  State A
     Program One
     Program-One

When Umbraco makes a nice URL out of "program one" it will replace a space with hyphen, so both "program-one" and "program one" end up with same URL.

Hopefully might give you some clue as to why it's happening...

In my case It was caused by a Simple 301 - Redirect Manager

If we try to redirect an existing URL to a new URL this happens to the existing (node) URL.

I got the error when i copy the root in same level.
I dont know its an optimal solution or not, I just added a new domain in culture and hostname like http://existing-domain.com/home-v2
Now i can see the url of copied root node as /home-v2/.

is working on a reply...