The following warning message has just begun appearing at the top of my website. I turned off Mobile Joomla so the message no longer displays for visitors. Thanks in advance for helping me to sort this out.

Warning: unserialize() [function.unserialize]: Function spl_autoload_call() hasn't defined the class it was called for in /home/lionsong/public_html/plugins/system/mobilebot/mobilebot.php on line 71

My website is www.michaelandamy.com

This fixed worked for me

github.com/mobilejoomla/mobilejoomla/blob/master/packages/plugins/mobilebot/mobilebot.php

The fix is to change the line in /plugins/system/mobilebot.php from
$cached_data = unserialize($cached_data);
to
$cached_data = @unserialize($cached_data);

Thanks for all your help lionsong!

-Jim D.

You got it, James D! Enjoy your evening.