OBJECTS_OBJREF_NOT_ASSIGNED error in a background execution

Question

Hi,
I have a problem at the background execution of my program. I have this error : "OBJECTS_OBJREF_NOT_ASSIGNED"
Information on where terminated                                    
    Termination occurred in the ABAP program "SAPLCNDP" - in       
     "DP_CONTROL_ASSIGN_TABLE".                                    
    The main program was "ZFI__SAPHIR_ES_SPLIT_TRIP_HEAD ".                                                                               
In the source code you have the termination point in line 1    
    of the (Include) program "LCNDPU10".                           
    The program "SAPLCNDP" was started as a background job.        
    Job Name....... "ZFI__SAPHIR_ES_SPLIT_TRIP_HEAD"               
    Job Initiator.. "COULOUMIESXA"                                 
    Job Number..... 15580300                                                                               
Source Code Extract                                                                               
Line  SourceCde                                                                               
>>>>> FUNCTION DP_CONTROL_ASSIGN_TABLE.                            
    2 *"----
    3 ""Lokale Schnittstelle:                                    
    4 *"  IMPORTING                                                
    5 *"     REFERENCE(H_DP) TYPE  CNTL_HANDLE OPTIONAL            
    6 *"     REFERENCE(H_CNTL) TYPE  CNTL_HANDLE                   
    7 *"     VALUE(TABNAME) LIKE  X030L-TABNAME OPTIONAL           
    8 *"     VALUE(MEDIUM) TYPE  C OPTIONAL                        
    9 *"     VALUE(PROPERTYNAME) TYPE  C                           
   10 *"     VALUE(DATE) LIKE  SY-DATUM OPTIONAL                   
   11 *"     VALUE(TIME) LIKE  SY-UZEIT OPTIONAL                   
   12 *"     VALUE(DESCRIPTION) TYPE  C OPTIONAL                   
   13 *"  TABLES                                                   
   14 *"      DATA                                                 
   15 *"      TABFIELDS STRUCTURE  RFC_FIELDS OPTIONAL             
   16 *"      COLUMNS_TO_STRETCH TYPE  TABLE_OF_STRINGS OPTIONAL   
   17 *"  EXCEPTIONS                                               
   18 *"      DP_ERROR_CREATE                                      
   19 *"      DP_ERROR_SEND_DATA                                   
   20 *"      DP_ERROR_ASSIGN                                      
Active Calls/Events                                                                               
No.   Ty.          Program                             Include                             Line 
      Name                                                                               
6 FUNCTION     SAPLCNDP                            LCNDPU10                                1
      DP_CONTROL_ASSIGN_TABLE                                                                   
    5 METHOD       CL_GUI_FRONTEND_SERVICES======CP    CL_GUI_FRONTEND_SERVICES======CM007    63
      CL_GUI_FRONTEND_SERVICES=>DIRECTORY_LIST_FILES                                            
    4 FORM         ZFI__SAPHIR_ES_SPLIT_TRIP_HEAD      ZFI__SAPHIR_ES_SPLIT_INTERFACE        141
      DIRECTORY_LIST_FILES                                                                      
    3 FORM         ZFI__SAPHIR_ES_SPLIT_TRIP_HEAD      ZFI__SAPHIR_ES_SPLIT_TRIP_HEAD        165
      %_SEL_SCREEN                                                                               
2 MODULE (PAI) ZFI__SAPHIR_ES_SPLIT_TRIP_HEAD      ZFI__SAPHIR_ES_SPLIT_TRIP_HEAD        805
      %_END_OF_SCREEN                                                                               
1 EVENT        ZFI__SAPHIR_ES_SPLIT_TRIP_HEAD      <SYSINI>                               20
      SYSTEM-EXIT                                                                               
Thanks for help.

Answer 1

How do I retrieve a file list in background without use directory_file_list method?? I try this code of the RSWATCH0 program:
CALL 'C_DIR_READ_START' ID 'DIR'    FIELD a_dir_name
                          ID 'FILE'   FIELD a_generic_name
                          ID 'ERRNO'  FIELD file-errno
                          ID 'ERRMSG' FIELD file-errmsg.
DO.
    CLEAR file.
    CALL 'C_DIR_READ_NEXT'
      ID 'TYPE'   FIELD file-type
      ID 'NAME'   FIELD file-name
      ID 'LEN'    FIELD file-len
      ID 'OWNER'  FIELD file-owner
      ID 'MTIME'  FIELD file-mtime
      ID 'MODE'   FIELD file-mode
      ID 'ERRNO'  FIELD file-errno
      ID 'ERRMSG' FIELD file-errmsg.
ENDDO.
But, I retrieve files of SAP server random... I don't retrieve my files!