TNS-12560: Message 12560 not found; No message file for product=network, facility=TNS

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​​problem: 
             Message 1053 not found; No message file for product=network, facility=TNSTNS-12541:         Message 12541 not found; No message file for product=network, facility=TNS 
           TNS-12560: Message 12560 not found; No message file for product=network, facility=TNS
          TNS-00511: Message 511 not found; No message file for product=network, facility=TNS
         Linux Error: 111: Connection refused 

solution: 
              set below variable on OS  level :
    #export ORACLE_SID=<oracle db name>
    #export ORACLE_HOME=<oracle_home> <take oracle home location from /etc/oratab file>
    #export PATH=/usr/sbin:$PATH
     #export PATH=$ORACLE_HOME/bin:$PATH 
   
          then run the command which giving the error after execution.


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