I am using Joomla 1.5.14 and Artio JoomSEF v3.3.6

Within my JoomSEF config I have under the "404 Page" section the following:

Show page: Front Page
Show 404 Message: No
Record 404 Page

Also under "Default 404 Page ItemID" I have the HOME menu item selected.

This works on most pages but not all of them

For example interactiveonline.com/folder-not-here does redirect the viewer to the FrontPage but the URL interactiveonline.com/blog/not-here returns the error:

-------------------------------
404 - Article #0 not found
You may not be able to visit this page because of:

an out-of-date bookmark/favourite
a search engine that has an out-of-date listing for this site
a mistyped address
you have no access to this page
The requested resource was not found.
An error has occurred while processing your request.
Please try one of the following pages:

Home Page
If difficulties persist, please contact the System Administrator of this site.

Article #0 not found
-------------------------------

The page just shows the error message, nothing else. I need it to at least show my site structure such as the top menu items so I created an article called FILE NOT FOUND with ID 0 but still the error comes up.

Any ideas how to fix this?

Please move to correct forum. I think I posted this to the incorrect one. It's not an extension problem but a problem with the Paid version of JoomSEF.

Hello,
well, I think this already has been discussed here.
There is not much we can do, because this error is thrown by the Joomla core. If fact, the URL is valid, but the variable parameters (item id) is not. So basically, JoomSEF sees the URL is fine and hand over the control to appropriate component (com_content in this case).
This components find out the parameter is not correct and throws the standard Joomla error.

Basically, only way how to fix / prevent this is to find the source of the problem. That means, where the URL with incorrect variable value has been generated and fix the problem there. Most likely, this is just an invalid link pointing from other part of your website.

I have article #0 created. It's the 404 Page but for some reason it still continues to show the error.

Any further ideas?

I think that using 0 as article Id might be slightly problematic in Joomla. Did you try to change it to anything else?

Yes tried various IDs for the 404 article. Currently I have it set to ID 5891

I also changed my JoomSEF config to display the Default 404 Page which is ID 5891

Pages that don't exist such as interactiveonline.com/not-here return the correct 404 page above.

Other URLs that are sub-folders within other folders such as interactiveonline.com/solutions/not-here and interactiveonline.com/blog/not-here still return the error:

404 - Article #0 not found