Solved Strange installation problem

Hi

I am trying to install the latest Kunena on a J!2.5.28.
Unfortunately the installation stop and I get error 500 before the installation popup open and continue with the rest.
I enabled the debug to Maximum and when I returned I got these errors:

Sorry, installation failed with following error:

Notice: Use of undefined constant KPATH_ADMIN - assumed 'KPATH_ADMIN' in /opt/lampp/htdocs/pdan/administrator/components/com_kunena/install/schema.php on line 13

Notice: Use of undefined constant KPATH_ADMIN - assumed 'KPATH_ADMIN' in /opt/lampp/htdocs/pdan/administrator/components/com_kunena/install/schema.php on line 14

Notice: Trying to get property of non-object in /opt/lampp/htdocs/pdan/administrator/components/com_kunena/install/schema.php on line 401

Warning: Invalid argument supplied for foreach() in /opt/lampp/htdocs/pdan/administrator/components/com_kunena/install/schema.php on line 422

Fatal error: Class 'KunenaRoute' not found in /opt/lampp/htdocs/pdan/administrator/components/com_kunena/install/sql/install/php/sampledata.php on line 147


I am at a loss because when I tried to another J!2.5.28 it worked like a charm.
I also tried in a clean installation and again worked like a charm.

Can u help me pls?

Thanks!

Clear the Joomla cache and try it again.

Solution found..
I have Fabrik installed.
I had to disable Fabrik system plugin and move it on top of the order before I install Kunena.
I did it and the installation done!!

P.S. I share it just in case someone else has the same problem

P.S. I share it just in case someone else has the same problem

Thank you!