Search notes:
ORA-12514: TNS:listener does not currently know of service requested in connect descriptor
$ sqlplus rene/secretGarden@db
…
ERROR:
Ora-12514: TNS:listener does not currently know of service requested in connect
descriptor
The listener is running …
$ tnsping db
…
OK
… but the listener does not know how to connect to the instance that is specified with the connection identifier's service_name.