Error Message: The Window Switcher installation is broken, resources are missing. Contact your distribution about this.

From time to time, after I Alt-Tab to switch the current window, I get mysterious notification about broken window switcher. In Polish it reads

    Instalacja przełącznika okien jest uszkodzona, brakuje zasobów.
    Powiadom o tym swoją dystrybucję.

(screenshot attached). Roughly translating back to English it means

    Installation of window switcher is broken, lack of resources.
    Let your distribution know.

(unfortunately I failed to find source of this message so don't know actual English text).

Once it happens, it usually reappears on every or almost every Alt-Tab (and those messages stack).

Apart from this message things seem to work more-or-less fine (windows are switched).

I report the bug for two reasons:

1. I have absolutely no clue what does the error mean, which resources may be missing (my computer does not seem to be lacking anything, there is a lot of spare memory, disk, low I/O etc), which program reports it, and what I am, or am not, expected to do. So, as the minimum, it would be great if somebody could patch this message so it actually gives a clue what happened.

2. Error message explicite asks me to let my distribution know (I suppose „distribution” in this context means Linux distribution, Ubuntu in my case)(.

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I use 2-monitor setup (and IIRC I never saw this problem on single monitor) and nvidia binary drivers.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: kwin-x11 4:5.5.5-0ubuntu1
ProcVersionSignature: Ubuntu 4.4.0-64.85-lowlatency 4.4.44
Uname: Linux 4.4.0-64-lowlatency x86_64
NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
ApportVersion: 2.20.1-0ubuntu2.5
Architecture: amd64
CurrentDesktop: KDE
Date: Mon Mar 20 16:36:22 2017
EcryptfsInUse: Yes
InstallationDate: Installed on 2013-02-18 (1491 days ago)
InstallationMedia: Ubuntu-Server 12.04.1 LTS "Precise Pangolin" - Release amd64 (20120817.3)
SourcePackage: kwin
UpgradeStatus: Upgraded to xenial on 2016-08-04 (227 days ago)