Internal error: ...

    If you receive any of the following internal errors, please submit an
    SPR along with the specific error and behavior that produced the
    error.

     Internal error:  BACKUP options are not available for this screen.
     Internal error:  Invalid function code.
     Internal error:  Message stack is empty.
     Internal error:  No more message ID stack space is available.
     Internal error:  Too many text display lines for pop-up box.