Error in Control Framework in smart forms programms

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IN VF02 smartforms ENTRY form , I add a function about save PDF at local PC. When I print the smartfomrs,There is ERROR message in update modules.

IN SM13 can see the ERROR message.

Function Module: RV_MESSAGE_UPDATE

Status :Update was terminated

Error details: FES 022: Error in Control Framework

THE CODE:

FORM processing USING proc_screen

CHANGING cf_retcode.

.......

******I ADD THE CODE

PERFORM DOWNLOAD_AS_PDF USING lf_fm_name

ls_control_param

ls_composer_param

ls_bil_invoice

nast

repeat

ls_bil_invoice-HD_ORG

ls_spoolid

CHANGING cf_retcode

.

.......

ENDFORM.

IN DOWNLOAD_AS_PDF FORM ,I USE FUNCTION : P_fm_name(smartforms function) CONVERT_OTF GUI_DOWNLOAD

WHY the UPDATE MODULE have ERROR MESSAGE???

How do I solve this problem？？？