Plz help me i'm really stuck

Hi
i connected my oracle database with vb6 using oo4o. I get the following error message
Run-time error '440';
Unable to make connection, ORA-12545: Connect failed because target host or object does not exist
TNS-12545 Connect failed because target host or object does not exist
Does anybody know what i can do??/
Thanks

ORA-12545: Connect failed because target host or object does not exist
Cause: The address specified is not valid, or the program being connected to does not exist.
Action: Ensure the ADDRESS parameters have been entered correctly; the most likely incorrect parameter is the node name. Ensure that the executable for the server exists (perhaps &quo;oracle&quo; is missing.) If the protocol is TCP/IP, edit the TNSNAMES.ORA file to change the host name to a numeric IP address and try again.

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