when i give the command, sqlplus "sys/prasad@newDB as sysdba", iam getting the following error

SQL*Plus: Release 9.2.0.1.0 - Production on Fri May 5 10:04:27 2006

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ERROR:
ORA-12505: TNS:listener could not resolve SID given in connect descriptor


Enter user-name:



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With Regards
Prasad