Hello, I just realized that my Kate won't run in KDE 4.10.2 that I just upgraded a few days ago. This is the error message from terminal:

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master@master:~$ kate
QDBusConnection: session D-Bus connection created before QCoreApplication. Application may misbehave.
kate(6870)/kdecore (services) KServicePrivate::property: Request for unknown property ' "X-Kate-PluginName" '
kate(6870)/kdecore (services) KServicePrivate::property: Request for unknown property ' "X-Kate-PluginName" '
kate(6870)/kdecore (services) KServicePrivate::property: Request for unknown property ' "X-Kate-PluginName" '
kate(6870)/kdecore (services) KServicePrivate::property: Request for unknown property ' "X-Kate-PluginName" '
kate(6870)/kdecore (services) KServicePrivate::property: Request for unknown property ' "X-Kate-PluginName" '
kate(6870)/kdecore (services) KServicePrivate::property: Request for unknown property ' "X-Kate-PluginName" '
kate(6870)/kdecore (services) KServicePrivate::property: Request for unknown property ' "X-Kate-PluginName" '
kate(6870)/kdecore (services) KServicePrivate::property: Request for unknown property ' "X-Kate-PluginName" '
kate(6870)/kdecore (services) KServicePrivate::property: Request for unknown property ' "X-Kate-PluginName" '
kate(6870)/kdecore (services) KServicePrivate::property: Request for unknown property ' "X-Kate-PluginName" '
kate(6870)/kdecore (services) KServicePrivate::property: Request for unknown property ' "X-Kate-PluginName" '
kate(6870)/kdecore (services) KServicePrivate::property: Request for unknown property ' "X-Kate-PluginName" '
kate(6870)/kdecore (services) KServicePrivate::property: Request for unknown property ' "X-Kate-PluginName" '
kate(6870)/kdecore (services) KServicePrivate::property: Request for unknown property ' "X-Kate-PluginName" '
kate(6870)/kdecore (services) KServicePrivate::property: Request for unknown property ' "X-Kate-PluginName" '
kate(6870)/kdecore (services) KServicePrivate::property: Request for unknown property ' "X-Kate-PluginName" '
kate(6870)/kdecore (services) KServicePrivate::property: Request for unknown property ' "X-Kate-PluginName" '
kate(6870)/kdecore (services) KServicePrivate::property: Request for unknown property ' "X-Kate-PluginName" '
kate(6870)/kdecore (services) KServicePrivate::property: Request for unknown property ' "X-Kate-PluginName" '
kate(6870)/kdecore (services) KServicePrivate::property: Request for unknown property ' "X-Kate-PluginName" '
kate(6870)/kdecore (services) KServicePrivate::property: Request for unknown property ' "X-Kate-PluginName" '
kate(6870)/kdecore (services) KServicePrivate::property: Request for unknown property ' "X-Kate-PluginName" '
kate(6870)/kdecore (services) KServicePrivate::property: Request for unknown property ' "X-Kate-PluginName" '
kate(6870)/kdecore (services) KServicePrivate::property: Request for unknown property ' "X-Kate-PluginName" '
kate(6870)/kdecore (services) KServicePrivate::property: Request for unknown property ' "X-Kate-PluginName" '
kate(6870)/kdecore (services) KServicePrivate::property: Request for unknown property ' "X-Kate-PluginName" '
kate(6870)/kdecore (services) KServicePrivate::property: Request for unknown property ' "X-Kate-PluginName" '
kate(6870)/kate-filetree KateFileTreePluginView::KateFileTreePluginView: BEGIN: mw: Kate::MainWindow(0x86652d0)
kate(6870)/kate-filetree ProxyItem::ProxyItem: ProxyItem(0x8727b00,0x0,-1,QObject(0x0) ,"m_root")
kate(6870)/kate-filetree ProxyItem::ProxyItem: ProxyItem(0x86485f0,0x0,-1,QObject(0x0) ,"Untitled")
kate(6870)/kate-filetree KateFileTreeModel::documentOpened: before add: ProxyItem(0x86485f0,0x0,-1,KateDocument(0x8631118) , "Untitled" )
kate(6870)/kate-filetree KateFileTreeModel::setupIcon: BEGIN!
kate(6870)/kate-filetree KateFileTreeModel::setupIcon: END!
kate(6870)/kate-filetree KateFileTreeModel::handleInsert: BEGIN!
kate(6870)/kate-filetree KateFileTreeModel::handleInsert: empty item
kate(6870)/kate-filetree ProxyItem::addChild: added ProxyItem(0x86485f0,0x8727b00,0,KateDocument(0x8631118) , "Untitled" )   to ProxyItemDir(0x8727b00,0x0,-1,"m_root", children:1)
kate(6870)/kate-filetree KateFileTreeModel::documentOpened: after add: ProxyItem(0x86485f0,0x8727b00,0,KateDocument(0x8631118) , "Untitled" )
kate(6870)/kate-filetree KateFileTreeProxyModel::KateFileTreeProxyModel: BEGIN!
kate(6870)/kdecore (services) KServicePrivate::property: Request for unknown property ' "X-Kate-PluginName" '
kate(6870)/kate-filetree KateFileTreePluginView::setListMode: BEGIN
kate(6870)/kate-filetree KateFileTreePluginView::setListMode: treeMode
kate(6870)/kate-filetree KateFileTreePluginView::setListMode: END
Object::connect: No such signal Kate::MainWindow::unhandledShortcutOverride(QEvent*)
Object::connect: No such signal Kate::MainWindow::pluginViewCreated (const QString &, Kate::PluginView *)
Object::connect: No such signal Kate::MainWindow::pluginViewDeleted (const QString &, Kate::PluginView *)
kate: symbol lookup error: /usr/lib/kde4/katesearchplugin.so: undefined symbol: _ZN4Kate10MainWindow10pluginViewERK7QString
master@master:~$


I can't open Kate even via Terminal. I can't work with my texts in Kate (my favorite). I have reinstall it but same problem occured. What should I do?

the last line of the errors is the key - "symbol lookup error" usually indicates that there is a disconnect in the libraries installed, I would look at the Kate package and make sure the appropriate version is installed

Okay, solved by doing upgrade via Synaptic for 2 packages:

Upgraded the following packages:
libkateinterfaces4 (4:4.8.5-0ubuntu0.1) to 4:4.10.2-0ubuntu1~ubuntu12.04~ppa2
libkatepartinterfaces4 (4:4.8.2-0ubuntu2) to 4:4.10.2-0ubuntu1~ubuntu12.04~ppa2

You are right, there are libraries don't upgraded yet in my system, for Kate. Thank you.

But now my Kate doesn't have Menu Bar. Even with Ctrl+M and Win+M. How to get Menu Bar back?

Are you using unity? It sometimes takes menu bars away, doesn't it?

in file ~/.kde/share/config/katrc
in the [MainWindow] section
add the line: MenuBar=Enabled

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in file ~/.kde/share/config/katrc
in the [MainWindow] section
add the line: MenuBar=Enabled

Wow, amazing! Solved directly by editing that katerc in Leafpad. Thank you, Admin. Thank you, Developer. We all meet again in this thread

My new curiosity is: what makes katerc variable value changed? And why Ctrl+M doesn't overwrite it into Enabled? Unity makes it or another?

the lack of ctrl+m has been posted on bugs.kde.org, voting on it might help it get resolved

It has occurred in the past that crashing applications like what you experienced have "damaged" configuration files, which might explain why the menubar disappeared on you.