cannot able to clear cache files

Hello, 
As I read you have an issue with your cache file. You aren't able to delete your cache files.
Actually, you get on a fatal error because you use a wrong code or you call your cache files via wrong way.
To resolve this issue you have to call your cache files via right code  which is given below
$this->cache->delete('cache_item_id');
Put your cache item id their
$this->cache->clean();

var_dump($this->cache->cache_info());

Hope this will help you 
Thanks