Problem : Spool Request 0 does not exist ..

Question

Hi, I have a report to be converted to PDF format and then download the pdf as a local file. The code are as below.
My problem is each time i execute my program, it will show me a message saying "Spool request 0 does not exist". Then i wil have to delete that particular code (the code below), activate the program and then copy and paste back the code (the code below from elsewhere) and activate it again. The code i copied is exactly the same, nothing is changed. But i dont want to practice this method everytime i execute my program.
What are the cause to this problem and how should i solve it ? Please advise me..
Thanks.
Extracted Code ****
*&      Form  print_pdf
FORM print_pdf .
STRUCTURES
  DATA: mstr_print_parms LIKE pri_params,
        mc_valid(1)      TYPE c,
        mi_bytecount     TYPE i,
        mi_length        TYPE i,
        mi_rqident       LIKE tsp01-rqident.
INTERNAL TABLES
  DATA: mtab_pdf    LIKE tline OCCURS 0 WITH HEADER LINE,
        mc_filename LIKE rlgrap-filename.
  CONCATENATE 'c:\EEOReport-' sy-datum '_' sy-uzeit '.pdf' INTO mc_filename.
Setup the Print Parmaters
  CALL FUNCTION 'GET_PRINT_PARAMETERS'
    EXPORTING
      destination    = space
      copies         = '1'
      list_name      = space
      list_text      = space
      immediately    = space
      release        = space
      new_list_id    = 'X'
      expiration     = '1'
      line_size      = 132
      line_count     = 65
      layout         = 'X_65_132'
      sap_cover_page = 'X'
      receiver       = 'SAP*'
      department     = ''
      no_dialog      = 'X'
    IMPORTING
      out_parameters = mstr_print_parms
      valid          = mc_valid.
  IF mc_valid <> space.
    NEW-PAGE PRINT ON PARAMETERS mstr_print_parms NO DIALOG.
    NEW-PAGE PRINT OFF.
  ENDIF .
Make sure that a printer destination has been set up
If this is not done the PDF function module ABENDS
  IF mstr_print_parms-pdest = space.
    mstr_print_parms-pdest = 'LOCL'.
  ENDIF.
Explicitly set line width, and output format so that
the PDF conversion comes out OK
  mstr_print_parms-linsz = 132.
  mstr_print_parms-paart = 'X_65_132'
Find out what the spool number is that was just created
  PERFORM get_spool_number USING sy-repid
             sy-uname
    CHANGING mi_rqident.
Convert Spool to PDF
  CALL FUNCTION 'CONVERT_ABAPSPOOLJOB_2_PDF'
    EXPORTING
      src_spoolid              = mi_rqident
      no_dialog                = space
      dst_device               = mstr_print_parms-pdest
    IMPORTING
      pdf_bytecount            = mi_bytecount
    TABLES
      pdf                      = mtab_pdf
    EXCEPTIONS
      err_no_abap_spooljob     = 1
      err_no_spooljob          = 2
      err_no_permission        = 3
      err_conv_not_possible    = 4
      err_bad_destdevice       = 5
      user_cancelled           = 6
      err_spoolerror           = 7
      err_temseerror           = 8
      err_btcjob_open_failed   = 9
      err_btcjob_submit_failed = 10
      err_btcjob_close_failed  = 11
      OTHERS                   = 12.
  CALL FUNCTION 'DOWNLOAD'
    EXPORTING
      bin_filesize = mi_bytecount
      filename     = mc_filename
      filetype     = 'BIN'
    IMPORTING
      act_filename = mc_filename
    TABLES
      data_tab     = mtab_pdf.
ENDFORM.                    " print_pdf
*&      Form  get_spool_number
FORM get_spool_number  USING    P_SY_REPID
                                P_SY_UNAME
                       CHANGING P_MI_RQIDENT.
DATA: lc_rq2name LIKE tsp01-rq2name.
  SELECT * FROM tsp01 WHERE  rq2name = lc_rq2name
  ORDER BY rqcretime DESCENDING.
    P_MI_RQIDENT = tsp01-rqident.
    EXIT.
  ENDSELECT.
  IF sy-subrc NE 0.
    CLEAR P_MI_RQIDENT.
  ENDIF.
ENDFORM.                    " get_spool_number

Answer 1

Hi.. i've added this line
  submit (sy-repid) to sap-spool without spool dynpro
                                         spool PARAMETERS mstr_print_parms
                                         and return.
added before
*-- Find out what the spool number is that was just created
  perform get_spool_number using sy-repid
             sy-uname
It will keep going back to my selection-screen unless i click the back button. when i click on the back button it will only convert the pdf file and it can be converted succesfully. Is there any way where i can modify the code so that it wont return to the selection-screen again and again when i click one execute ??
Please assist... i need this urgently.. thanks