Unzip File and Read Contents

Hi,
I want to unzip a file(called outer.zip) present on the Presentation server and read inner.zip file which lies within the outer.zip.
i wrote the following program, but i am getting an error in the last step .Can some one tell me themistake i am committing here:
TYPES : BEGIN OF sda_content,
lv_buf(65535) type x,
END OF sda_content .
DATA : ls_sda_content type sda_content ,
        lt_sda_content type table OF sda_content .
DATA : lv_file_length type int4 .
DATA : x_buf TYPE xstring .
CALL FUNCTION 'GUI_UPLOAD'
EXPORTING
    filename                      = 'C:\outer.zip'
   FILETYPE                      = 'BIN'
IMPORTING
   FILELENGTH                    = lv_file_length
tables
    data_tab                      = lt_sda_content
CALL FUNCTION 'SCMS_BINARY_TO_XSTRING'
EXPORTING
    input_length       = lv_file_length
IMPORTING
   BUFFER             = x_buf
tables
    binary_tab         = lt_sda_content
clear : lt_sda_content ,lv_file_length,x_buf .
data : cl_inst type ref to cl_abap_zip .
CREATE OBJECT cl_inst.
CALL METHOD cl_inst->load
   EXPORTING
     zip             = x_buf.
CALL METHOD cl_inst->get
EXPORTING
    NAME                    = 'inner.zip'
IMPORTING
    CONTENT                 = x_buf.
Thanks and Regards,
Gaurav

Hi Gaurav Rathi ,
Even am facing some problem .I cannot open the ZIP file? Can you please tell me where exactly you have corrected your mistake?
Thanks
Dan

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