Latte dock is not showing on startup and an error mesaage is appearing

[Michail Vourlakos]

Some users reported the following for Kubuntu and Neon packages for version v0.8.2, can you please confirm that your package is ok? https://bugs.kde.org/show_bug.cgi?id=400568

SUMMARY
Latte-Dock isn't working. In it's place there is a error dialog with the following message:
"Error loading QML file: file:///usr/share/plasma/plasmoids/org.kde.latte.containment/contents/ui/main.qml:1830:26: ColorizerManager is not a type"

STEPS TO REPRODUCE
1. $ latte-dock --default-layout

OBSERVED RESULT
Error message

EXPECTED RESULT
A nice looking dock

SOFTWARE VERSIONS
(available in About System)
KDE Plasma Version: 5.12.7
KDE Frameworks Version: 5.47.0
Qt Version: 5.9.5

ADDITIONAL INFORMATION

[timesarehard4dreamers (timesarehard4dreamers)]

Created attachment 116014
screenshot

SUMMARY

STEPS TO REPRODUCE
1. Run latte dock

OBSERVED RESULT

a blank panel appears with this error along it:
Error loading QML file: file:///usr/share/plasma/plasmoids/org.kde.latte.containment/contents/ui/main.qml:1830:26: ColorizerManager is not a type

EXPECTED RESULT
it should run...

SOFTWARE VERSIONS
(available in About System)
KDE Plasma Version: 5.14.2
KDE Frameworks Version: 5.51.0
Qt Version: 5.11.2

ADDITIONAL INFORMATION

[Michail Vourlakos (psifidotos.v)]

How did you install Latte?

[Michail Vourlakos (psifidotos.v)]

I double checked in my system v0.8.2 and git version. I removed everything and reinstalled them. They both work properly.

You seem to have a broken installation, so how did you install Latte?

[timesarehard4dreamers (timesarehard4dreamers)]

(In reply to Michail Vourlakos from comment #2)
> How did you install Latte?

originally i used a third party repo but i then reinstalled with the deb file, made no difference

[timesarehard4dreamers (timesarehard4dreamers)]

(In reply to Michail Vourlakos from comment #3)
> I double checked in my system v0.8.2 and git version. I removed everything
> and reinstalled them. They both work properly.
>
> You seem to have a broken installation, so how did you install Latte?

I seem to recall Latte stopped working for me after upgrading Neon from 16.04 to 18.04 base.

[Michail Vourlakos (psifidotos.v)]

(In reply to Carl Draper from comment #5)
> (In reply to Michail Vourlakos from comment #3)
> > I double checked in my system v0.8.2 and git version. I removed everything
> > and reinstalled them. They both work properly.
> >
> > You seem to have a broken installation, so how did you install Latte?
>
> I seem to recall Latte stopped working for me after upgrading Neon from
> 16.04 to 18.04 base.

this is probably a distro issue.
Please contact with them in order to guide you how to fix this...

[Fernando-b-v-guimaraes (fernando-b-v-guimaraes)]

Created attachment 116035
Error message

SUMMARY
Latte-Dock isn't working. In it's place there is a error dialog with the following message:
"Error loading QML file: file:///usr/share/plasma/plasmoids/org.kde.latte.containment/contents/ui/main.qml:1830:26: ColorizerManager is not a type"

STEPS TO REPRODUCE
1. $ latte-dock --default-layout

OBSERVED RESULT
Error message

EXPECTED RESULT
A nice looking dock

SOFTWARE VERSIONS
(available in About System)
KDE Plasma Version: 5.12.7
KDE Frameworks Version: 5.47.0
Qt Version: 5.9.5

ADDITIONAL INFORMATION

[Michail Vourlakos (psifidotos.v)]

*** This bug has been marked as a duplicate of bug 400531 ***

[Michail Vourlakos (psifidotos.v)]

*** Bug 400568 has been marked as a duplicate of this bug. ***

[Michun (gerhard-kulzer)]

I confirm this bug.
It exists in all versions after 0.8.75+git20181023.0746-0~ubuntu18.04~ppa1 (lst one working correctly) up to 0.8.75+git20181031.1137-0~ubuntu18.04~ppa1

Same software version as above

[Fernando-b-v-guimaraes (fernando-b-v-guimaraes)]

Hello! I have the same issue, reinstalled latte-dock from old repo and new KDE repo. The issue persists! My distro is Kubuntu.

[Michail Vourlakos (psifidotos.v)]

(In reply to Fernando from comment #8)
> Hello! I have the same issue, reinstalled latte-dock from old repo and new
> KDE repo. The issue persists! My distro is Kubuntu.

https://bugs.launchpad.net/ubuntu/+source/latte-dock/+bug/1801290

[The Punisher (melprinsi)]

In many cases, this can be resolved by removing the qmlcache located in ~/.cache/lattedock/qmlcache/

as reported by RiK Mills @ https://launchpad.net/~rikmills/+archive/ubuntu/latte-dock

[Michail Vourlakos (psifidotos.v)]

Kubuntu devs propose to clear the qmlcache:

https://bugs.launchpad.net/ubuntu/+source/latte-dock/+bug/1801290

[Fernando-b-v-guimaraes (fernando-b-v-guimaraes)]

(In reply to Michail Vourlakos from comment #10)
> Kubuntu devs propose to clear the qmlcache:
>
> https://bugs.launchpad.net/ubuntu/+source/latte-dock/+bug/1801290

It worked, thanks a lot! I recommend the following command to reset the dock:
$ latte-dock --default-layout --replace

[timesarehard4dreamers (timesarehard4dreamers)]

removing the qmlcache located in ~/.cache/lattedock/qmlcache/
fixed it for me, thanks

[Rik Mills (rikmills)]

0.8.75+git20181023.0746-0~ubuntu18.04~ppa1 is an experimental PPA package from upstream git, not an official package.

For the record, if the issue is that latte cannot run with a stale qml cache in ~/.cache/lattedock/qmlcache/ then this is an upstream KDE issue that cannot be addressed in distro packaging. We can't and shouldn't act on any file in a user home when doing a package upgrade via sudo/admin. This should be fixed by KDE by having latte detect that it is being run for the first time by a user after a version upgrade, and at that point removing or modifying the cache with that user's privileges.

[Rik Mills (rikmills)]

If the issue is that latte cannot run with a stale qml cache in ~/.cache/lattedock/qmlcache/ then this is an upstream KDE issue that cannot be addressed in distro packaging. We can't and shouldn't act on any file in a user home when doing a package upgrade via sudo/admin. This should be fixed by KDE by having latte detect that it is being run for the first time by a user after a version upgrade, and at that point removing or modifying the cache with that user's privileges.

[Michail Vourlakos (psifidotos.v)]

(In reply to Rik Mills from comment #12)
> If the issue is that latte cannot run with a stale qml cache in
> ~/.cache/lattedock/qmlcache/ then this is an upstream KDE issue that cannot
> be addressed in distro packaging. We can't and shouldn't act on any file in
> a user home when doing a package upgrade via sudo/admin. This should be
> fixed by KDE by having latte detect that it is being run for the first time
> by a user after a version upgrade, and at that point removing or modifying
> the cache with that user's privileges.

if you have any idea how to do that in Latte, feel free to send a patch,
my important question of course is why this is not needed from plasmashell

[Rik Mills (rikmills)]

(In reply to Michail Vourlakos from comment #13)
> if you have any idea how to do that in Latte, feel free to send a patch,
> my important question of course is why this is not needed from plasmashell

I have no idea sadly. I don't know what is specific and different about the latte code that is causing this.