This graph type requires at leaset 2 coulmns of data

Dear all,
yesterday i just started to use the java bean to display a graph in forms 10g R2
and i have a table called dba_conncted_user and its like the following strucure:
Day No_Of_Users_Connected
01-02-2007 11:12 AM 50
01-02-2007 11:14 AM 30
01-02-2007 11:16 AM 15
01-02-2007 11:18 AM 60
01-02-2007 11:20 AM 45
so i want to show a vertical line graph and i am using the following procedur, but i got the above message that the data has an insufficient number of columns, this graph type requires at lease 2 coulmns of data. the data provided has 1 coulmn
the procedure as the following:
Procedure Affiche_Graph
vBeanArea varchar2,
vDelimiter varchar2
) IS
     vData varchar(4000);
     Cursor C_Test is
     Select to_char(ddcu_user_count) a, to_number(to_char(ddcu_date, 'ddmmrrrrhhmm') ) b, to_number(to_char(ddcu_date, 'ddmmrrrrhhmm') ) c
          from test_graph
     Where to_char(ddcu_date, 'dd-mm-rrrr hh:mm') = to_char(Sysdate, 'dd-mm-rrrr hh:mm')
     And Rownum < 7000
Order By to_char(ddcu_date, 'dd-mm-rrrr hh:mm') ;
BEGIN
SET_CUSTOM_PROPERTY('BL_GRAPH.GRAPH',1,'GRAPHTYPE','VERTICAL_LINE_GRAPH');
for ctest in c_test loop
vData :='Total '||vDelimiter||ctest.A||vDelimiter||ctest.B;
SET_CUSTOM_PROPERTY(vBeanArea,1,'ADD_ROWDATA',vData);
End Loop ;
SET_CUSTOM_PROPERTY(vBeanArea,1,'ADD_DATA_TO_GRAPH','');     
END;
thanks and best regards,
Ashraf

Hi,
do you have any solution for this problem?
Roman

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