A computer readable medium stores a program causing a computer to execute a process for error recovery. In one embodiment, application data corresponding to a plurality of software applications hosted by respective network devices is stored in a network database. The ingress switch is an entry point for the data packets as the data packets traverse the SDN network. The integrated driving chip not only drives the gate driving circuit and line block selecting circuit, but also controls the operation of the LCD panel to display an image. The first sheath portion has a first outlet opening. The through hole is covered with a wateroil-repellent film comprising a porous film.