Sticky [SOLVED] Another menu item has the same alias in Root

I get the following error too:
What could I do about this?
Install Kunena
Installeer Kunena
Installer detected failed or interrupted installation attempt!
An incomplete installation of Kunena 1.6.4 build 4832 was found in your system. This means that the installation either failed or was interrupted.
Install Kunena 1.6.4.
HINT: Use this option to complete your installation. This action will create new forum with sample data in it.

WARNING: If you have already installed Kunena 1.6 and then later decided to downgrade back to , any new messages since the upgrade will not be imported using this option. Please migrate your old version instead.

Thank you for this answer. I am getting after doing this the next error:

Installeer Kunena
Installer detected failed or interrupted installation attempt!
An incomplete installation of Kunena 1.6.4 build 4832 was found in your system. This means that the installation either failed or was interrupted.
Install Kunena 1.6.4.
HINT: Use this option to complete your installation. This action will create new forum with sample data in it.

WARNING: If you have already installed Kunena 1.6 and then later decided to downgrade back to , any new messages since the upgrade will not be imported using this option. Please migrate your old version instead.

Please read what I wrote in msg #20

I also suggest that you we deal first with the issues you raised in Installing language stopped: There is no core packet for this language (EN-GB) . Instead of spreading your questions over several topics, let's try to stay focused on what's important.

I have this same problem. I've read through everything but I don't see anywhere where it describes how to fix the problem.

I already have a site built which I don't really want to build from the ground up just so I can install Kunena first. Is there anyway to get Kunena working? :whistle:

G'day, WCSI, and Welcome to Kunena.

Yes, there is a way to get Kunena installed but first I suggest you read what I wrote earlier in this topic

sozzled wrote: I fixed a problem like this a little while ago - see [SOLVED] Installation problem (although I did not give the exact details of what the problem was or specifically what we did to fix it because it's "tricky") but, if you're interested I might be able to help you.

What we need to know, first, is what version of Joomla you have installed.

Okay, I know what you mean. That I have posted two topics on two different places was by accident...
I have read what you said. Including the installation / upgrade steps. Does this mean that first of all I have to install Joomla 1.5 and directly after it Joomla 1.6 before I could install Kunena 1.6? I hope not because Kunena is ment to be a new module of an existing website...
Or does it mean that I have to instal Kunena 1.5 before Kunena 1.6?

Actually is the last error I have had this one:

FAILED Uncaught Exception: Een ander menu-item heeft dezelfde alias in de root. Root is hoofdmap op het hoogste niveau

FAILED Uncaught Exception: Another menu-item has the same alias in the root. Root is the firstmap on the highest level.

All this after: Install Sample Data

I suppose that I have done all the steps I needed and what could I do more?