problem with user

Hi

I have two problems with JoomSocial.
The first is some problem with user account. When I logged (refer to optional information) in I get en error:

CRASH: PHP segmentation violation in stristr() called at [/social/plugins/system/jfdatabase/intercept.jdatabasemysqli.php:235], in interceptDB::query() called at [/social/plugins/system/jfdatabase/jfdatabase_inherit.php:687], in JFDatabase::query() called at [/social/plugins/system/jfdatabase/intercept.jdatabasemysqli.php:88], in interceptDB::loadObjectList() called at [/social/administrator/components/com_easysocial/includes/db/helpers/joomla30.php:46], in call_user_func_array() called at [/social/administrator/components/com_easysocial/includes/db/helpers/joomla30.php:46], in SocialDBHelperJoomla30::__call() called at [/social/administrator/components/com_easysocial/includes/db/db.php:199], in SocialDBHelperJoomla30::loadObjectList() called at [/social/administrator/components/com_easysocial/includes/db/db.php:199], in call_user_func_array() called at [/social/administrator/components/com_easysocial/includes/db/db.php:199], ..., in JComponentHelper::renderComponent() called at [/social/includes/application.php:197], in JSite::dispatch() called at [/social/index.php:42]

The same error is when I go to my account menu and click Friends (that is the link http://e-wolontariat.pl/social/en/spolecznosc2/friends ).


Other error I go in site menu to ask ( polish nam - Zadania ). When I add new ask (button Ask a Question - polish: Dodaj zadanie) it show erron on submit.

Fatal error: Class 'EasydiscussCategories' not found in /social/libraries/joomla/application/categories.php on line 151

The new ask is saved but when I want do click on the name I get again the same error.


I will be grateful for your help
Tomasz