connection refuse with redis and phpfastcache

I am trying to set a connection to redis using phpfastcache but I keep getting connection refuse

Here is my simple code:

        $defaultDriver = 'Redis';
        $Psr16Adapter = new Psr16Adapter($defaultDriver);

        if(!$Psr16Adapter->has('foo'))
        {
            $Psr16Adapter->set('foo', 'test', 300);
        }
        else
        {
            $data = $Psr16Adapter->get('foo');
        }

now what I am exactly getting is:

Message: Redis failed to connect with the following error message: "Connection refused" line 77 in /var/www/html/vendor/phpfastcache/phpfastcache/lib/Phpfastcache/Drivers/Redis/Driver.php

Filename: /var/www/html/vendor/phpfastcache/phpfastcache/lib/Phpfastcache/Core/Pool/DriverBaseTrait.php

Line Number: 76