En includes/defines.php

 
define('JPATH_ROOT',          implode(DIRECTORY_SEPARATOR, $parts));

define('JPATH_SITE',          JPATH_ROOT);

define('JPATH_CONFIGURATION', JPATH_ROOT);

define('JPATH_ADMINISTRATOR', JPATH_ROOT . DIRECTORY_SEPARATOR . 'administrator');

define('JPATH_LIBRARIES',     JPATH_ROOT . DIRECTORY_SEPARATOR . 'libraries');

define('JPATH_PLUGINS',       JPATH_ROOT . DIRECTORY_SEPARATOR . 'plugins');

define('JPATH_INSTALLATION',  JPATH_ROOT . DIRECTORY_SEPARATOR . 'installation');

define('JPATH_THEMES',        JPATH_BASE . DIRECTORY_SEPARATOR . 'templates');

**define('JPATH_CACHE',         JPATH_BASE . DIRECTORY_SEPARATOR . 'cache');**

define('JPATH_MANIFESTS',     JPATH_ADMINISTRATOR . DIRECTORY_SEPARATOR . 'manifests');

Hay que cambiar tambien en el directorio administrator/includes/defines.php
define('JPATH_SITE',			JPATH_ROOT);

define('JPATH_CONFIGURATION',	JPATH_ROOT);

define('JPATH_ADMINISTRATOR',	JPATH_ROOT . '/administrator');

define('JPATH_LIBRARIES',		JPATH_ROOT . '/libraries');

define('JPATH_PLUGINS',			JPATH_ROOT . '/plugins'  );

define('JPATH_INSTALLATION',	JPATH_ROOT . '/installation');

define('JPATH_THEMES',			JPATH_BASE . '/templates');

**define('JPATH_CACHE',         JPATH_BASE . DIRECTORY_SEPARATOR . 'cache');**

define('JPATH_MANIFESTS',		JPATH_ADMINISTRATOR . '/manifests');

En el administrator/com_cache/models/cache.php

Por la linea 115

	'cachebase'		=> ($this->getState('clientId') == 1) ? JPATH_ADMINISTRATOR . '/cache' : $conf->get('cache_path', JPATH_SITE . '/cache')

Cambiar por 
	'cachebase'		=> ($this->getState('clientId') == 1) ? JPATH_ADMINISTRATOR . '/cache' : $conf->get('cache_path',JPATH_CACHE)