getting error on opening joomla administration - Joomla! Forum - community, help and support

joomla not opening on giving right password....what cud b reason , pls me possible ........it giving error written
jauthentication::__construct: not load authentication libraries.

there nothing wrong password have tried phpmyadmin, ok there other problem associated it.......help plssssss,i have worked on more 2 days unstoppedly

hi rahuljainonfire...

review discussion has similar topic :
viewtopic.php?p=1069616
and
viewtopic.php?t=105214

regards.