AC-50480: Internal error occurred: java.lang.Exception: Error while generating listener.ora.

Issue:

Got the below error while running autoconfig on AppTier.

Updating s_tnsmode to 'generateTNS'
UpdateContext exited with status: 0
AC-50480: Internal error occurred: java.lang.Exception: Error while generating listener.ora.
Error generating tnsnames.ora from the database, temporary tnsnames.ora will be generated using templates
Instantiating Tools tnsnames.ora
Tools tnsnames.ora instantiated
Web tnsnames.ora instantiated

adgentns.pl exiting with status 2
ERRORCODE = 2 ERRORCODE_END


Background of Environment:

This is a cloned environment from production.

Solution:

All entries in the FND_NODES tables belongs to prod instance, no entry for current non-prod environment. Which means clone steps did not perform completely.  Follow below steps to fix the above issue.

1) Connect to database using apps and do fnd_nodes clean up.
  
  sqlplus apps/<apps_password>
  SQL> exec fnd_conc_clone.setup_clean;

2) Run autoconfig on dbTier
3) Run autoconfig on appsTier