java.sql.SQLExcpetion: No data found...

this is the first time i saw this error,
java.sql.SQLException: No data found
        at sun.jdbc.odbc.JdbcOdbc.standardError(JdbcOdbc.java:7139)
        at sun.jdbc.odbc.JdbcOdbc.SQLGetDataString(JdbcOdbc.java:3908)
   
What is this mean?
SimpleDateFormat db_format = new SimpleDateFormat( "MM/dd/yyyy" ) ;
SimpleDateFormat user_format = new SimpleDateFormat("dd/MM/yyyy");

This is my code:
 PreparedStatement ps = conn.prepareStatement( "SELECT * FROM ACB WHERE " +
    "    (A > ? AND A < ?)  "+
    " OR (B > ? AND B < ? ) " ) ;
    ps.setDate( 1, new java.sql.Date( db_format.parse( dateA ).getTime() ) );
    ps.setDate( 2, new java.sql.Date( db_format.parse( dateB ).getTime() ) );
    ps.setDate( 3, new java.sql.Date( db_format.parse( dateA ).getTime() ) );
    ps.setDate( 4, new java.sql.Date( db_format.parse( dateB ).getTime() ) );
.
.
.
out.println(counter + ":"+ rs.getString("Cust_Name") + user_format.format(rs.getDate("A")) );
out.println(counter + ":"+ rs.getString("Cust_Name") + user_format.format(rs.getDate("B")) );