Fatal error Call to undefined method JModel addIncludePath() - Joomla! Forum - community, help and support

fatal error: call undefined method jmodel::addincludepath() in /home/bathtu5/public_html/manchem/plugins/system/widgetkit_joomla/helper.php on line 70

this error @ buttom of home page.

how revoke same error:

step one: access administrator panel-->components-->widgetkit-->slideshow-->click buttom "use joomla" , create 1 widget named "flashnews"-->select article category "news"-->save

step two: administrator panel-->extensions-->module manager-->create module named "frontflashnews" click "new" buttom-->choose module type "widgetkit"-->position "top-b" , menu assignment "home"-->appoint widget "flashnews" --> save

now can check home page, error @ page bottom.
fatal error: call undefined method jmodel::addincludepath() in /home/bathtu5/public_html/manchem/plugins/system/widgetkit_joomla/helper.php on line 70

system details:

database version: 5.5.24-cll
database collation: utf8_general_ci
php version: 5.3.15
web server: apache
webserver php interface: cgi-fcgi
joomla! version: joomla! 3.0.0 stable [ ember ] 27-september-2012 14:00 gmt
joomla! platform version: joomla platform 12.1.0 stable [ louis landry ] 10-may-2012 00:00 gmt
zoo: 3.0
widgetkit: 1.3
nano2 joomla 3.0

try jmodellegacy
extensions need made ready j3.0!
register class instead off addpath!