I am using Linux Mint Sarah and I am receiving this error whenever I use the command "kate file_name". I already updated my Kate and I believe it is already at its latest version.
QObject::connect: invalid null parameter
QObject::connect: invalid null parameter
QObject::connect: Cannot connect (null)::returnPressed() to KUrlRequester::returnPressed()
QObject::connect: Cannot connect (null)::returnPressed(QString) to KUrlRequester::returnPressed(QString)
Setting the name of 0x10e71d0 to "org.kde.ActivityManager.ActivityTemplates"
Setting the name of 0x11130a0 to "org.kde.ActivityManager.RunApplication"
Setting the name of 0x11019c0 to "org.kde.ActivityManager.Resources.Scoring"
Creating directory: "/root/.local/share/kactivitymanagerd/resources/"
KActivities: Database connection: "kactivities_db_resources_139836748884160_readwrite"
query_only: QVariant(qlonglong, 0)
journal_mode: QVariant(QString, "wal")
wal_autocheckpoint: QVariant(qlonglong, 100)
synchronous: QVariant(qlonglong, 1)
Service started, version: 7.0.0
Michał Walenciak :
What you get here is a kde's developers mistake and they should fix it. These warnings should not affect you however, just ignore it.\n\nYou can try to fill a bug report at KDE Bugs page to let them now.",
2016-11-13T09:31:56