ORA-12545: Connect failed because target host or object does not exist.

Autoconfig failed with below error in RAC ENVIRONMENT
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ORA-12545: Connect failed because target host or object does not exist.

Metalink says: 
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Troubleshooting ORA-12545 / TNS-12545 Connect failed because target host or object does not exist (Doc ID 553328.1)

Cause : Issue with tns.

Solution: 
Wrong hostname in ifile