Theme application issues

QDBusConnection: error: could not send signal to service "" path "//home/marcmatias/.config/kdedefaults/kdeglobals" interface "org.kde.kconfig.notify" member "ConfigChanged": Invalid object path: //home/marcmatias/.config/kdedefaults/kdeglobals

I get this error when I apply the themes I just downloaded. For example, I changed my mouse cursor. This error appeared when I tried to apply it. Now I see my downloaded mouse cursor when I move it over the applications, but when I come to my desktop, the default kde mouse cursor is.