OCC throw error about Acpu not available

[SysKeeper]

Well, it is exactly the error you posted at

How use OCC as a beginner. Have never used it

When I try this: sudo -u www-data php occ -V i get CP\HintException: [0]: Memcache OC\Memcache\APCu not available for local cache (Is the matching PHP module installed and enabled?) It is installed

I posted a link to the documentation and @devnull quoted the relevant part in
How use OCC as a beginner. Have never used it - #8 by devnull.

So really not sure what is different now?!