wrong number of argument error when calling report from forms 11gR2

As error suggests.. you are trying to invoke/call a procedure which has either more or less number of arguments which it is expected as input..

check the procedure call..i think you had posted the procedure which you think the error message had reported.. where in you have to correct the code where this procedure is being called..

ie., in a simple way..

count the number of parameters from the invoking code, count the number of parameters in the actual procedure code.. both should match..

I'm unable to locate the specific document that shows the allowed syntax for SET_REPORT_OBJECT_PROPERTY but all the examples I find have report_id as the first parameter.

I see no examples with a parameter before it so my guess it is REPORTS that is causing the error.

i did like this  SET_REPORT_OBJECT_PROPERTY(rep_id, SYNCHRONOUS, RUNTIME, FILESYSTEM, pl_id, NULL); but still geting error am not calling a procedure am calling a report

even this still geve error
RUN_REPORT_OBJECT(rep_id, SYNCHRONOUS, RUNTIME, FILESYSTEM, pl_id, NULL);

i use this and it works
RP2RRO.setDestype( 'PREVIEW');

  rp2rro.rp2rro_run_product(REPORTS, rep_id, SYNCHRONOUS, RUNTIME, FILESYSTEM, pl_id, NULL);

slightwv is right about first parameter:
 
report_id
     Specifies the unique ID of the report to be run. You can get the report ID for a particular report using the Built-in FIND_REPORT_OBJECT

There are another problems:
1) this is wrong: SET_REPORT_OBJECT_PROPERTY(rep_id, SYNCHRONOUS, RUNTIME, FILESYSTEM, pl_id, NULL);
because SET_REPORT_OBJECT_PROPERTY built-in has only 3 parameters.

This example is from on-line help:
SET_REPORT_OBJECT_PROPERTY Examples

DECLARE
 repid REPORT_OBJECT;
 report_prop VARCHAR2(20);
BEGIN
 repid := find_report_object('report4');
 SET_REPORT_OBJECT_PROPERTY(repid, REPORT_EXECUTION_MODE, BATCH);
 SET_REPORT_OBJECT_PROPERTY(repid, REPORT_COMM_MODE, SYNCHRONOUS);
 SET_REPORT_OBJECT_PROPERTY(repid, REPORT_DESTYPE, FILE);
END;

2) RUN_REPORT_OBJECT(rep_id, SYNCHRONOUS, RUNTIME, FILESYSTEM, pl_id, NULL); is also wrong, because RUN_REPORT_OBJECT built-in has 1 or 2 parameters - second is parameter list.
This example is also from on-line help:

RUN_REPORT_OBJECT Example
 DECLARE
 repid REPORT_OBJECT;
 v_rep VARCHAR2(100);
 rep_status VARCHAR2(20);
BEGIN
 repid := FIND_REPORT_OBJECT('report4');
 v_rep := RUN_REPORT_OBJECT(repid); --or  v_rep := RUN_REPORT_OBJECT(repid,pl_id);
 ...
END;

i did this
 repid := FIND_REPORT_OBJECT('REPORTS');
    v_rep := RUN_REPORT_OBJECT(repid,pl_id);

but am geting this error
expression 'REPID' cannot be used as an assigment

Please show the complete code.

PROCEDURE run_reports (rep_id IN Varchar2,
                       command_id Varchar2,
                       unit_id IN Varchar2,
                       dept_id IN Varchar2,
                       mec_id IN Varchar2,
                       syc_id IN Varchar2,
                       baseline_id IN Varchar2,
                       fail_id IN Varchar2,
                       upper_dev IN Varchar2,
                       lower_dev IN Varchar2,
                       min_avail IN Varchar2,
                       start_date IN Varchar2,
                       end_date IN Varchar2,
                       combined_mec IN Varchar2,
                       nsn IN Varchar2,
                       repid REPORT_OBJECT,
                       v_rep VARCHAR2,
                       rep_status VARCHAR2) IS
  pl_id ParamList;
/* */  
BEGIN
  pl_id := Get_Parameter_List('tmpdata');
  IF NOT Id_Null(pl_id) THEN
      Destroy_parameter_list(pl_id);
  END IF;
  pl_id := Create_parameter_list('tmpdata');
  
  Add_parameter(pl_id, 'COMMAND' ,TEXT_PARAMETER, command_id);
  Add_parameter(pl_id, 'UNIT' ,TEXT_PARAMETER, unit_id);
  Add_parameter(pl_id, 'DEPARTMENT' ,TEXT_PARAMETER, dept_id);
  Add_parameter(pl_id, 'MAIN_EQUIPMENT_CODE' ,TEXT_PARAMETER, mec_id);
  Add_parameter(pl_id, 'SYSTEM_CODE' ,TEXT_PARAMETER, syc_id);
  Add_parameter(pl_id, 'BASELINE' ,TEXT_PARAMETER, baseline_id);
  Add_parameter(pl_id, 'FAILURE' ,TEXT_PARAMETER, fail_id); 
  Add_parameter(pl_id, 'UPPER' ,TEXT_PARAMETER, upper_dev);
  Add_parameter(pl_id, 'LOWER' ,TEXT_PARAMETER, lower_dev);
  Add_parameter(pl_id, 'MIN_AVAIL' ,TEXT_PARAMETER, min_avail);
  Add_parameter(pl_id, 'START_DATE' ,TEXT_PARAMETER, start_date);
  Add_parameter(pl_id, 'END_DATE' ,TEXT_PARAMETER, end_date);
  Add_parameter(pl_id, 'COMBINED_MEC' ,TEXT_PARAMETER, combined_mec);
  Add_parameter(pl_id, 'NSN' ,TEXT_PARAMETER, nsn);
  Add_parameter(pl_id, 'PARAMFORM' ,TEXT_PARAMETER, 'NO');
  Add_parameter(pl_id, 'ORIENTATION' ,TEXT_PARAMETER, 'LANDSCAPE');
  Add_parameter(pl_id, 'DESTYPE' ,TEXT_PARAMETER, 'PREVIEW');

repid := FIND_REPORT_OBJECT('REPORTS');
v_rep := RUN_REPORT_OBJECT(repid,pl_id);


am geting wrong number of argument

is there a way i can do this without adding this 3
repid REPORT_OBJECT,
                       v_rep VARCHAR2,
                       rep_status VARCHAR2 
as this procedure is been called somewhere

END;
                                  

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am geting expression 'REPID' cannot be used as an assigment
not am geting wrong number of argument