I found the thread from 2 months ago of someone having the same problem:
compojoom.com/forum/2-general-talk/15058...-work-on-adsmamanger
So I followed the changes you suggested on administrator/com_comment/plugin/com_adsmanager/josc_com_adsmanager.php
and I was able to see the link to add comments on my web site.
The problem is that I cannot write comments, so I followed the second suggestion in the same post :
change 2 functions in administrator/component/com_comment/plugin/com_adsmanager/josc_com_adsmanager.class.php
but I get the same error as in the post
"Fatal error: Call to undefined method JOSC_com_adsmanager::getCatId() in /var/www/..../administrator/components/com_comment/plugin/com_adsmanager/josc_com_adsmanager.class.php on line 120"
Did you manage to make it work ?
thanks
Lydia