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ORA-12505, TNS:listener does not currently know of SID given in connect des

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Hi, i'm new with Oracle. I'm using JDeveloper 10g, when i try to create a database connection with the hr/hr user i get this message:

Listener refused the connection with the following error:
ORA-12505, TNS:listener does not currently know of SID given in connect descriptor
The Connection descriptor used by the client was:
localhost:1521:ORCL


Please, if somebpdy could give me a tip, i repeat, i'm new with Oracle. Thanks
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