"Unable to create io-slave: klauncher said: Unknown protocol ''

[Joey Mendez]

The whole message in .xsession-errors file:

Opera(PID): couldn't create slave: "Unable to create io-slave:
klauncher said: Unknown protocol ''.
"

I haven't experienced any problem, but everytime when I save any file (regardless to filetype or extension) I got this message in the .xsession-errors file. Why? How can I solve?

I sometimes get this message with this:

Opera(PID)/kio (KDirModel) KDirModelPrivate::_k_slotDeleteItems: No node found for item that was just removed: KUrl("file:///home/user/Documents/<name of the saved file>
Opera(PID): couldn't create slave: "Unable to create io-slave:
klauncher said: Unknown protocol ''.
"

Despite this error message the file saved properly.