I just finished install Joomla 2.5 and then I did log-in at administrator but I got error message
"JAuthentication: :__construct: Could not load authentication libraries."
AND home page I got bellow message
JERROR_LOADING_MENUS
Error loading component: , 1
Component not found
I download "Joomla_2.5.8-Stable-Full_Package.zip" from joomla.org. So I tried to do
Find "Extantions" table.
In extantions table, go to page 3 or 4, and find there "plg_authentication_joomla" - enaible it from 0 to 1.
but not work.
Please advise me.
Had this happen to me personally and it turned out to be a bad DB dump. Fixed by dropping and re importing the DB.
You should go to joomla databases and find the "extensions" table ,you must enable the "plg_authentication_joomla" and "plg_user_joomla" from 0 to 1. After that,it will work!
-------------------- Found Solution -----------------------
- I back up online website's admistrator folder
- Install new Joomla on localhost
- Replace online website's administrator folder with local one
- Then I can login to website admin panel but some errors appear on front page and website not appears. Screwed up again.
- Then I re-use online website's administrator folder and surprisingly, my problem solved (I can login to my admin panel and website appearing very well)
(Joomla 2.5) JAuthentication: :__construct: Could not load authentication libraries
Find "plg_twofactorauth_totp" in the Extension table, set Enabled from 1 to 0, you can access your Administrator without Authentication. If you want to set Authentication agian, just try! (:
来源：https://stackoverflow.com/questions/13376345/joomla-2-5-got-jauthentication-construct-could-not-load-authentication-libr