Once I try to open file in some editor or project in IDE, for instance file in Kate or project in QtCreator, the File open dialog shows up, but whatever location I click (home, root, mounted disks, ...), there are no files to select. The situation is logged in terminal with following error/warn:
URL cannot be listed
trash:/"
couldn't create slave: "Unable to create io-slave:
klauncher said: Unknown protocol 'file'.
How do I fix that?