Nepomuk Service stops / stand still (KDE Icon says "stands still")

/usr/bin/nepomukservicestub digikamnepomukservice' crashed!

After digikam updates

Reproducible: Always

Steps to Reproduce:
1. start linuxmint / kde
2. nepomuk will strart indexing
3. nepomuk hangs up
Actual Results:  
normal system updates, e.g. digikam


QDBusConnection: session D-Bus connection created before QCoreApplication. Application may misbehave.
[/usr/bin/nepomukservicestub] Using Virtuoso Version: "6.1.4.3127-pthreads"
[/usr/bin/nepomukservicestub] Using Virtuoso Version: "6.1.4.3127-pthreads"
[/usr/bin/nepomukservicestub] void Soprano::VirtuosoController::writeConfigFile(const QString&, const BackendSettings&) "/tmp/virtuoso_hX6688.ini"
[/usr/bin/nepomukservicestub] (LockFile) could not set lock for "/home/michael/.kde/share/apps/nepomuk/repository/main/data/virtuosobackend/soprano-virtuoso.db" 
Shutting down Virtuoso instance (1940) which is in our way.
[/usr/bin/nepomukservicestub] (LockFile) could not set lock for "/home/michael/.kde/share/apps/nepomuk/repository/main/data/virtuosobackend/soprano-virtuoso.db"
[/usr/bin/nepomukservicestub] Starting Virtuoso server: "/usr/bin/virtuoso-t" ("+foreground", "+configfile", "/tmp/virtuoso_hX6688.ini", "+wait")
[/usr/bin/nepomukservicestub] "
" 
"               Wed Nov 14 2012
" 
"11:16:04 OpenLink Virtuoso Universal Server
" 
"11:16:04 Version 06.01.3127-pthreads for Linux as of Feb 15 2012
" 
"11:16:04 uses parts of OpenSSL, PCRE, Html Tidy
"
[/usr/bin/nepomukservicestub] "11:16:04 Database version 3126
"
[/usr/bin/nepomukservicestub] "11:16:04 Entering Lite Mode
" 
"11:16:04 SQL Optimizer enabled (max 1000 layouts)
"
[/usr/bin/nepomukservicestub] "11:16:05 Compiler unit is timed at 0.000424 msec
"
[/usr/bin/nepomukservicestub] "11:16:06 Roll forward started
" 
"11:16:06 Roll forward complete
"
[/usr/bin/nepomukservicestub] "11:16:07 Checkpoint started
"
[/usr/bin/nepomukservicestub] "11:16:07 Checkpoint finished, log reused
"
[/usr/bin/nepomukservicestub] "11:16:07 Server online at 1111 (pid 6693)
"
[/usr/bin/nepomukservicestub] Virtuoso started: 6693
[/usr/bin/nepomukservicestub] Soprano::ODBC::ConnectionPool::ConnectionPool(const QString&, const QStringList&, QObject*) "host=localhost:1111;uid=dba;pwd=dba;driver=/usr/lib/odbc/virtodbc_r.so"
[/usr/bin/nepomukservicestub] Soprano::ODBC::Connection::Connection() QThread(0x1c24320)
[/usr/bin/nepomukservicestub] "/usr/bin/nepomukservicestub(6688)" Soprano: "SQLGetData for data length failed (iODBC Error: [OpenLink][Virtuoso iODBC Driver]CL056: Bookmarks not enable for statement)"
bool Soprano::Virtuoso::DatabaseConfigurator::updateFulltextIndexRules(bool) empty rule name!
[/usr/bin/nepomukservicestub] virtual Soprano::ODBC::Connection::~Connection() QThread(0x1c24320)
[/usr/bin/nepomukservicestub] Soprano::ODBC::Connection::Connection() QThread(0x1c24320)
[/usr/bin/nepomukservicestub] virtual void Soprano::Server::LocalServer::incomingConnection(quintptr) 
void Soprano::Server::ServerCorePrivate::addConnection(Soprano::Server::ServerConnection*) New connection. New count: 1
[/usr/bin/nepomukservicestub] virtual void Soprano::Server::LocalServer::incomingConnection(quintptr)
[/usr/bin/nepomukservicestub] void Soprano::Server::ServerCorePrivate::addConnection(Soprano::Server::ServerConnection*) New connection. New count: 2
[/usr/bin/nepomukservicestub] Soprano::ODBC::Connection::Connection() Soprano::Server::ServerConnection(0x1e44b20)
[/usr/bin/nepomukservicestub] virtual void Soprano::Server::LocalServer::incomingConnection(quintptr)
[/usr/bin/nepomukservicestub] void Soprano::Server::ServerCorePrivate::addConnection(Soprano::Server::ServerConnection*) New connection. New count: 3
[/usr/bin/nepomukservicestub] Failed to start service digikamnepomukservice (Der Dienst „digiKam-Nepomuk-Dienst“ stellt kein Interface „Nepomuk2::Service“ mit dem Schlüsselwort „“ bereit).
Application '/usr/bin/nepomukservicestub digikamnepomukservice' crashed! 4 restarts left.
[/usr/bin/nepomukservicestub] Soprano::ODBC::Connection::Connection() Soprano::Server::ServerConnection(0x1e49cf0)
[/usr/bin/nepomukservicestub] Failed to start service digikamnepomukservice (Der Dienst „digiKam-Nepomuk-Dienst“ stellt kein Interface „Nepomuk2::Service“ mit dem Schlüsselwort „“ bereit).
Application '/usr/bin/nepomukservicestub digikamnepomukservice' crashed! 3 restarts left.
[/usr/bin/nepomukservicestub] Failed to start service digikamnepomukservice (Der Dienst „digiKam-Nepomuk-Dienst“ stellt kein Interface „Nepomuk2::Service“ mit dem Schlüsselwort „“ bereit).
Application '/usr/bin/nepomukservicestub digikamnepomukservice' crashed! 2 restarts left.
[/usr/bin/nepomukservicestub] Failed to start service digikamnepomukservice (Der Dienst „digiKam-Nepomuk-Dienst“ stellt kein Interface „Nepomuk2::Service“ mit dem Schlüsselwort „“ bereit).
Application '/usr/bin/nepomukservicestub digikamnepomukservice' crashed! 1 restarts left.
[/usr/bin/nepomukservicestub] Failed to start service digikamnepomukservice (Der Dienst „digiKam-Nepomuk-Dienst“ stellt kein Interface „Nepomuk2::Service“ mit dem Schlüsselwort „“ bereit).
Application '/usr/bin/nepomukservicestub digikamnepomukservice' crashed! 0 restarts left.
[/usr/bin/nepomukservicestub] Failed to start service digikamnepomukservice (Der Dienst „digiKam-Nepomuk-Dienst“ stellt kein Interface „Nepomuk2::Service“ mit dem Schlüsselwort „“ bereit).
Application '/usr/bin/nepomukservicestub digikamnepomukservice' crashed to often. Giving up!
[/usr/bin/nepomukservicestub] Soprano::ODBC::Connection::Connection() QThread(0x1e79df0, name = "Thread (pooled)")
[/usr/bin/nepomukservicestub] Soprano::ODBC::Connection::Connection() QThread(0x2167cf0, name = "Thread (pooled)")
[/usr/bin/nepomukservicestub] QObject::connect: Cannot connect XSyncBasedPoller::destroyed() to (null)::_k_x11FilterDestroyed()