Installation Errors

I installed the plug in late last night following the instructions at: joomdonation.com/index.php?option=com_co...icle&id=43&Itemid=41

I received an error that the documents folder did not exist, so I created it. Then, I received some errors, which I'm sorry to say I did not write down. I noticed that after the install, I could not edit articles and once I logged out of the admin area, I can no longer log back in...the error it display is: Fatal error: Call to undefined method stdClass::onAuthenticate() in /home/mydomain/public_html/libraries/joomla/user/authentication.php on line 121

(of course "mydomain" was replaced for this public post)

Line 121 shows:
// Try to authenticate
$plugin->onAuthenticate($credentials, $options, $response);

Any ideas?

Joomla was installed with Fantastico.

Hi

I looked at the error code you sent here but It seems it is not related to DMS . Could you send me your site information so that I can check and let you know what is wrong with the site .

Thanks,

Tuan