An error caused the session with the z/OS shell to end. Earlier error messages may contain more information about this error. No more input data can be typed into the input area.
If you press the <ENTER> or <CLEAR> key, or scroll forward, the currently displayed session ends, and OMVS automatically displays another session. You can also scroll the screen backward, switch to TSO/E, go into subcommand mode, or invoke the help facility.