Yii2 — MemCache. The problem with the inclusion?

I have a problem with using MemCache.
I'm developing a website on Yii2, server OpenServer. OS - Windows 10.
Once turned on MemCache:

'cache' => [
 'class' => 'yii\caching\MemCache',
 'useMemcached' => true,
],

And OpenServer -> settings -> Modules I have included.
But is issued here such error:
"Requires the PHP MemCache memcached extension to be loaded."
And I don't know what to do, please tell me. For the past two weeks)