EXP oracle data

Help! - unable to EXP oracle data, get error:
EXP-00056: ORACLE error 12545 encountered
ORA-12545: Connect failed because target host or object does not exist
EXP-00000: Export terminated unsuccessfully
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I can get to the db, not a dba, not sure if access to db objects is the problem.

-weeze

re: EXP oracle data

Can someone help with my request. Need help to EXP ora data

re: EXP oracle data

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 "oracle" 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.

re: EXP oracle data

This error may be due to lookup problem which means when the client computer tries to look up the hostname of the
database server to get its IP address, the lookup is failing. possible checks: DNS, TCP /IP configuation,TNSnames