new $.hdb interface in sp9

Hello,

while working with new $.hdb  interface i am getting following error message, any idea what is the issue.

$.hdb.Connection.executeQuery: SQL error. NR: 402, ERROR: the user was already dropped before query execution at ptime/query/checker/query_check.cc:193

sample code:

try

{

var conn = $.hdb.getConnection();

  var query = "select * from  TST.TBLUSER";

  var results=conn.executeQuery(query);

  $.response.setBody(JSON.stringify(results));

}

catch(e)

{

  $.response.setBody(e.message);

}