Question Updated to 6,1 but

Can you guide me to do this ?

"please enable debug mode in Joomla! and Kunena configuration panel and give he error message with the backtrace"

I can enable debugmode in both, but dont know how to post it here

EDIT: When i make a post as adm after update to 6,1,1 i dont get a blank site in that topic, but in all the other maked before the update

You can find here in the docs how to do it : www.kunena.org/docs/en/troubleshooting/i...er-errors-and-kunena

I have fixed the issues about [url tag displayed and the other issue with ktemplate undefined, you can install the nigthly build avaiblable under Download in the bottom part

In the old version was an private message button in the red square and there was a number (ex big red 1) when there was a new private message.
The new version is not usefull 

 

And i still dont know what you mean whit "backtrace"

When i had talked about the backtrace i mean that :

 

 
 

maybe this is a limitation of your hoster?
I read a similar error message here
forum.joomla.org/viewtopic.php?t=992067
ps
and maybe has nothing to do with it,
but the joomla version is fully up to date, the latest version is ‎4.3.2 ?
I think I can see that the website version is 4.2.9.