Hello! I faced rather serious problem with Plasma and desperately need help. The thing is I installed several widgets for Plasma, and one of them, namely "Remember the milk", behaved strangely and crashed taking the whole Plasma desktop with it. I rebooted, but saw an error message after login and found myself with no Plasma desktop but with other applications like Opera working. I opened a terminal and runned plasma-desktop. The output is following:

QDBusConnection: session D-Bus connection created before QCoreApplication. Application may misbehave.
QDBusConnection: session D-Bus connection created before QCoreApplication. Application may misbehave.
Fontconfig warning: "/etc/fonts/conf.d/50-user.conf", line 9: reading configurations from ~/.fonts.conf is deprecated.
QDBusObjectPath: invalid path ""
plasma-desktop(4019): ""geometry" - conversion of "58,2,0,25" to QRectF failed"
plasma-desktop(4019): ""geometry" - conversion of "58,2,0,25" to QRectF failed"
plasma-desktop(4019): ""geometry" - conversion of "58,2,0,25" to QRectF failed"
plasma-desktop(4019): ""geometry" - conversion of "58,2,0,25" to QRectF failed"
plasma-desktop(4019)/libplasma Plasma::isPluginVersionCompatible: unversioned plugin detected, may result in instability
QGraphicsLinearLayout::insertItem: cannot insert null item
QGraphicsLinearLayout::insertItem: cannot insert null item
plasma-desktop(4019)/kdecore (services) KServiceFactory::findServiceByDesktopPath: "" not found
invalid literal for int() with base 10: '' : Setting default geometry (600x300).
plasma-desktop(4019)/kdecore (KLibrary) findLibraryInternal: plugins should not have a 'lib' prefix: "libkonsolepart.so"
QPainter::begin: Paint device returned engine == 0, type: 2
QPainter::setRenderHint: Painter must be active to set rendering hints
QPainter::setPen: Painter not active
QPainter::setFont: Painter not active
Request ready. Url is: "https://api.rememberthemilk.com/services/rest/?&api_key=631e881f0e5671d237c1a2a0a64d5b98&api_sig=72f3414004a1843860626f285fd7e44d&method=rtm.auth.getFrob"
stanislav@debian:~$ KCrash: Attempting to start /usr/bin/plasma-desktop from kdeinit
sock_file=/home/stanislav/.kde/socket-debian/kdeinit4__0
KCrash: Application 'plasma-desktop' crashing...
KCrash: Attempting to start /usr/lib/kde4/libexec/drkonqi from kdeinit
sock_file=/home/stanislav/.kde/socket-debian/kdeinit4__0
QSocketNotifier: Invalid socket 21 and type 'Read', disabling...

As far as I can see, the problem is indeed caused by Remember the milk widget. So could you please tell me how to completely remove it and fix this bug.

If you wish to remove the "Remember the Milk" widget and associated components, you should be able to start your package manager to do this. As Plasma Desktop isn't able to start, you'll need to use KRunner to start it, which you can access by pressing Alt + F2.

As for determining if Remember the Milk is the cause of this error, please provide the information from the "Developer Information" tab of the KDE Crash Handler window which opens when you login.

Thank you so much! I purged plasma-widgets-addons, everything is back to normal now.