Error while using File Upload through Frontend

Hi,

I need to upload an EXcel file , read the content and save the data to a db table. I used the

<htmlb:fileUpload id = "FileUpload"                            onUpload    = "HandleUpload"                            upload_text = "Upload"                     size        = "40"  />

But while calling the function for clipboard

CALL FUNCTION 'CLPB_IMPORT'    TABLES      data_tab   = excel_tab    EXCEPTIONS      clpb_error = 1      OTHERS     = 2.  IF sy-subrc <> 0.    MESSAGE a037(alsmex).  ENDIF.

It is throwing the 'message a alsmex 037 cannot be processed in plugin mode https'. Can you pleas guide me how to rectify this problem. Is there a note for this?

Regards,

Shiny