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. MORE... appears on the screen, because not all the available output data from the session fits on the screen.
If you press the <ENTER> or the <CLEAR> key, the OMVS command automatically scrolls the screen forward. You can also scroll the screen backward, switch to TSO/E, go into subcommand mode, or invoke the help facility.