Joomla\CMS\Cache\Storage\FileStorage::_deleteFolder You can't delete a base folder.
Joomla\CMS\Cache\Storage\FileStorage::_deleteFolder JFolder: :delete: Could not delete folder. Path: [ROOT]/cache/com_k2_extended
Joomla\CMS\Cache\Storage\FileStorage::_deleteFolder Failed deleting index.html
Joomla\CMS\Cache\Storage\FileStorage::_folders JFolder: :delete: Path is not a folder. Path: [ROOT]/cache/com_k2_extended
Joomla\CMS\Cache\Storage\FileStorage::_deleteFolder Failed deleting 6a633a0c98ea5db608e68e7375f2b86d-cache-com_k2_extended-e1b3a3727dc3f238e45b757a98561986.php
Joomla\CMS\Cache\Storage\FileStorage::_deleteFolder Failed deleting 6a633a0c98ea5db608e68e7375f2b86d-cache-com_k2_extended-b2535d48bb3ee6b8de7fe17488e13369.php
Joomla\CMS\Cache\Storage\FileStorage::_deleteFolder Failed deleting 6a633a0c98ea5db608e68e7375f2b86d-cache-com_k2_extended-0d7e76220bc39ac0adbee1ab8bd80c79.php
Joomla\CMS\Cache\Storage\FileStorage::_deleteFolder Failed deleting 6a633a0c98ea5db608e68e7375f2b86d-cache-com_k2_extended-7fcbdfef9e29bddf95493ceecab06c26.php