XF 1.2 Getting php error after enabling automatic_serialization in cache file

[EgyKit]

Hello,

I'm getting unserialize() error after enabling automatic_serialization in config file

    $config['cache']['frontendOptions'] = array('caching'  =>  true,
      'automatic_serialization' => true,
      'lifetime'  => 10800,
      'cache_id_prefix'  =>  'xf_'
    );

An exception occurred: unserialize() expects parameter 1 to be string, array given in /library/XenForo/Model/DataRegistry.php on line 117

XenForo_Application::handlePhpError()
unserialize() in XenForo/Model/DataRegistry.php at line 117
XenForo_Model_DataRegistry->getMulti() in XenForo/Dependencies/Abstract.php at line 144
XenForo_Dependencies_Abstract->preLoadData() in XenForo/FrontController.php at line 127
XenForo_FrontController->run() in /index.php at line 13

Any idea why I'm getting this? I've APC enabled in config file and running PHP as fastcgi

This is what I've in config file

    $config['cache']['enabled'] = true;
    $config['cache']['frontend'] = 'Core';
    $config['cache']['frontendOptions'] = array('caching'  =>  true,
      'automatic_serialization' => true,
      'lifetime'  => 10800,
      'cache_id_prefix'  =>  'xf_'
    );
    $config['cache']['backend'] = 'Apc';

 

[Mike]

If you change that value, you need to purge the cache (or change your cache prefix). It's invalidated all of the existing data.

 

[EgyKit]

If you change that value, you need to purge the cache (or change your cache prefix). It's invalidated all of the existing data.

Thank you, how to purge the zend cache? is there any php code?

 

[Mike]

Since you're using APC, restart your web server.