TNS-12545: Connect failed because target host or object does not exist_笨小孩的小跟班

$ lsnrctl start
LSNRCTL for Linux: Version 12.1.0.2.0 - Production on 26-JUL-2017 09:53:42
Copyright (c) 1991, 2014, Oracle.  All rights reserved.
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=mengqf)(PORT=1521)))
TNS-12545: Connect failed because target host or object does not exist
 TNS-12560: TNS:protocol adapter error
  TNS-00515: Connect failed because target host or object does not exist
   Linux Error: 111: Connection refused
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=EXTPROC1521)))
$ lsnrctl start
LSNRCTL for Linux: Versi