Error 42Y55

Hi,

I am getting the
ij> drop table tableName;
ERROR 42Y55: 'DROP TABLE' cannot be performed on 'tableName' because it
does not exist.
ij> exit

But, the table exists.
I verified using sys.systables.
what could be the reason.
I am using netbeans to generate hibernate mappings.
I also open command windows for server and another for connecting through ij  apart from netbeans.
I closed netbeans. I restarted the server. Tried to drop the table. Still I am getting the same error.
any body please help.
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Yours Sincerely,
Sridhar