TYPO3 Exception 1231267498

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Invalid cache backend option $optionKey for backend of type static::class

Most likely your cache configuration and the configured backend do not match the configured options. Change or remove the options and try again.

If you change the backend to NullBackend, make sure you remove the options.

This setup will throw the exception:

$GLOBALS['TYPO3_CONF_VARS']['SYS']['caching']['cacheConfigurations']['extbase_object']['backend'] = 'TYPO3\\CMS\\Core\\Cache\\Backend\\MemcachedBackend';
$GLOBALS['TYPO3_CONF_VARS']['SYS']['caching']['cacheConfigurations']['extbase_object']['options'] = array('servers' => array('localhost:11211'),);
$GLOBALS['TYPO3_CONF_VARS']['SYS']['caching']['cacheConfigurations']['extbase_object']['backend'] = 'TYPO3\\CMS\\Core\\Cache\\Backend\\NullBackend';

If you want to set it to NullBackend, do it like this:

$GLOBALS['TYPO3_CONF_VARS']['SYS']['caching']['cacheConfigurations']['extbase_object'] = array('backend' => 'TYPO3\\CMS\\Core\\Cache\\Backend\\NullBackend');

or clear the options:

$GLOBALS['TYPO3_CONF_VARS']['SYS']['caching']['cacheConfigurations']['extbase_object']['options'] = array();