Starting Kmail from Konsole says :
falken@wopr:~/.kde$ kmail
"/usr/bin/kmail(7609)" Soprano: "org.freedesktop.DBus.Error.ServiceUnknown - The name org.kde.nepomuk.services.nepomukstorage was not provided by any .service files"
"/usr/bin/kmail(7609)" Soprano: "QLocalSocket::connectToServer: Invalid name"
"/usr/bin/kmail(7609)" Soprano: "org.freedesktop.DBus.Error.ServiceUnknown - The name org.kde.nepomuk.services.nepomukstorage was not provided by any .service files"
"/usr/bin/kmail(7609)" Soprano: "QLocalSocket::connectToServer: Invalid name"
"/usr/bin/kmail(7609)" Soprano: "org.freedesktop.DBus.Error.ServiceUnknown - The name org.kde.nepomuk.services.nepomukstorage was not provided by any .service files"
"/usr/bin/kmail(7609)" Soprano: "QLocalSocket::connectToServer: Invalid name"
"/usr/bin/kmail(7609)" Soprano: "org.freedesktop.DBus.Error.ServiceUnknown - The name org.kde.nepomuk.services.nepomukstorage was not provided by any .service files"
"/usr/bin/kmail(7609)" Soprano: "Unsupported operation (2)": "Invalid model"
"/usr/bin/kmail(7609)" Soprano: "org.freedesktop.DBus.Error.ServiceUnknown - The name org.kde.nepomuk.services.nepomukstorage was not provided by any .service files"
"/usr/bin/kmail(7609)" Soprano: "Unsupported operation (2)": "Invalid model"
"/usr/bin/kmail(7609)" Soprano: "Unsupported operation (2)": "Invalid model"
"/usr/bin/kmail(7609)" Soprano: "Invalid iterator."
"/usr/bin/kmail(7609)" Soprano: "org.freedesktop.DBus.Error.ServiceUnknown - The name org.kde.nepomuk.services.nepomukstorage was not provided by any .service files"
"/usr/bin/kmail(7609)" Soprano: "QLocalSocket::connectToServer: Invalid name"
"/usr/bin/kmail(7609)" Soprano: "org.freedesktop.DBus.Error.ServiceUnknown - The name org.kde.nepomuk.services.nepomukstorage was not provided by any .service files"
"/usr/bin/kmail(7609)" Soprano: "Unsupported operation (2)": "Invalid model"
"/usr/bin/kmail(7609)" Soprano: "org.freedesktop.DBus.Error.ServiceUnknown - The name org.kde.nepomuk.services.nepomukstorage was not provided by any .service files"
"/usr/bin/kmail(7609)" Soprano: "Unsupported operation (2)": "Invalid model"
"/usr/bin/kmail(7609)" Soprano: "Unsupported operation (2)": "Invalid model"
"/usr/bin/kmail(7609)" Soprano: "Invalid iterator."
"/usr/bin/kmail(7609)" Soprano: "org.freedesktop.DBus.Error.ServiceUnknown - The name org.kde.nepomuk.services.nepomukstorage was not provided by any .service files"
"/usr/bin/kmail(7609)" Soprano: "QLocalSocket::connectToServer: Invalid name"
"/usr/bin/kmail(7609)" Soprano: "org.freedesktop.DBus.Error.ServiceUnknown - The name org.kde.nepomuk.services.nepomukstorage was not provided by any .service files"
"/usr/bin/kmail(7609)" Soprano: "QLocalSocket::connectToServer: Invalid name"
falken@wopr:~/.kde$ "/usr/bin/kmail(7609)" Soprano: "org.freedesktop.DBus.Error.ServiceUnknown - The name org.kde.nepomuk.services.nepomukstorage was not provided by any .service files"
"/usr/bin/kmail(7609)" Soprano: "QLocalSocket::connectToServer: Invalid name"
"/usr/bin/kmail(7609)" Soprano: "org.freedesktop.DBus.Error.ServiceUnknown - The name org.kde.nepomuk.services.nepomukstorage was not provided by any .service files"
"/usr/bin/kmail(7609)" Soprano: "Unsupported operation (2)": "Invalid model"
"/usr/bin/kmail(7609)" Soprano: "org.freedesktop.DBus.Error.ServiceUnknown - The name org.kde.nepomuk.services.nepomukstorage was not provided by any .service files"
"/usr/bin/kmail(7609)" Soprano: "Unsupported operation (2)": "Invalid model"
"/usr/bin/kmail(7609)" Soprano: "Unsupported operation (2)": "Invalid model"
"/usr/bin/kmail(7609)" Soprano: "Invalid iterator."
kmail2(7609)/libakonadi Akonadi::SpecialCollectionsRequestJob::slotResult: Failed SpecialCollectionsRequestJob::slotResult "Unknown error. (Failed to fetch the resource collection.)" 
kmail2(7609) MailCommon::Kernel::emergencyExit: "KMail encountered a fatal error and will terminate now.
The error was:
Failed to fetch the resource collection." 
kmail2(7609)/libakonadi Akonadi::SpecialCollectionsRequestJob::slotResult: Failed SpecialCollectionsRequestJob::slotResult "Unknown error. (Failed to fetch the resource collection.)" 
kmail2(7609) MailCommon::Kernel::emergencyExit: "KMail encountered a fatal error and will terminate now.
The error was:
Failed to fetch the resource collection." 
kmail2(7609)/libakonadi Akonadi::SpecialCollectionsRequestJobPrivate::resourceScanResult: Failed to request resource "akonadi_maildir_resource_0" : "Unknown error. (Failed to fetch the resource collection.)" 
kmail2(7609)/libakonadi Akonadi::SpecialCollectionsRequestJob::slotResult: Failed SpecialCollectionsRequestJob::slotResult "Unknown error. (Failed to fetch the resource collection.)" 
kmail2(7609) MailCommon::Kernel::emergencyExit: "KMail encountered a fatal error and will terminate now.
The error was:
Failed to fetch the resource collection." 
kmail2(7609)/libakonadi Akonadi::SpecialCollectionsRequestJobPrivate::resourceScanResult: Failed to request resource "akonadi_maildir_resource_0" : "Unknown error. (Failed to fetch the resource collection.)" 
kmail2(7609)/libakonadi Akonadi::SpecialCollectionsRequestJob::slotResult: Failed SpecialCollectionsRequestJob::slotResult "Unknown error. (Failed to fetch the resource collection.)" 
kmail2(7609) MailCommon::Kernel::emergencyExit: "KMail encountered a fatal error and will terminate now.
The error was:
Failed to fetch the resource collection." 
kmail2(7609)/libakonadi Akonadi::SpecialCollectionsRequestJobPrivate::resourceScanResult: Failed to request resource "akonadi_maildir_resource_0" : "Unknown error. (Failed to fetch the resource collection.)" 
kmail2(7609)/libakonadi Akonadi::SpecialCollectionsRequestJob::slotResult: Failed SpecialCollectionsRequestJob::slotResult "Unknown error. (Failed to fetch the resource collection.)" 
kmail2(7609) MailCommon::Kernel::emergencyExit: "KMail encountered a fatal error and will terminate now.
The error was:
Failed to fetch the resource collection." 
kmail2(7609)/libakonadi Akonadi::SpecialCollectionsRequestJobPrivate::resourceScanResult: Failed to request resource "akonadi_maildir_resource_0" : "Unknown error. (Failed to fetch the resource collection.)" 
kmail2(7609)/libakonadi Akonadi::SpecialCollectionsRequestJob::slotResult: Failed SpecialCollectionsRequestJob::slotResult "Unknown error. (Failed to fetch the resource collection.)" 
kmail2(7609) MailCommon::Kernel::emergencyExit: "KMail encountered a fatal error and will terminate now.
The error was:
Failed to fetch the resource collection." 
kmail2(7609)/libakonadi Akonadi::SpecialCollectionsRequestJobPrivate::resourceScanResult: Failed to request resource "akonadi_maildir_resource_0" : "Unknown error. (Failed to fetch the resource collection.)"