How to torn on? Writes "No path has been configured for the file system cache backend"

I install filecache and add this lines to settings.php

$settings['cache']['default'] = 'cache.backend.file_system';
$settings['filecache_paths']['default'] = '../filecache';

After that I had "unexpected error".

The errors I found are:

In FileSystemBackendFactory.php line 119:                                                                  
No path has been configured for the file system cache backend.

and

In Container.php line 157:                                                                          
You have requested a non-existent service "cache.backend.file_system".

What I did wrong?