507969 Fix Joomla Error

I have a website here: [url removed, login to view] . Its based on Joomla, my problem is that when I try in the backend I receive the following error:

Fatal error: Call to undefined method stdClass::onAuthenticate() in /home/xxxxxxx/public_html/libraries/joomla/user/[url removed, login to view] on line 121

I have pinpointed the error in plugins/legacy. But I don't know how to fix it.

I need someone to fix it for me TODAY.

No escrow. Payment in full once completed. Budget is $30

Beceriler: Her şey Kabul, Joomla, PHP

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Proje NO: #2253896