프로그램을 alv 로 뿌려주고요

  그 데이터를 엑셀로 다운 받고 싶어서 스텐더드의 toolbar 중에서 엑스포트 버튼을 누르면 덤프가 떨어지는데요.

 덤프내용이  이렇게 되어있는데....

 Short text
     Field symbol has not yet been assigned.

 어떤 문제가 발생했습니까?
     Error in the ABAP Application Program

     The current ABAP program "SAPLKKBL" had to be terminated because it has
     come across a statement that unfortunately cannot be executed.

 대응책은 무엇입니까?
     Note down which actions and inputs caused the error.

     To process the problem further, contact you SAP system
     administrator.

     Using Transaction ST22 for ABAP Dump Analysis, you can look
     at and manage termination messages, and you can also
     keep them for a long time.

 오류분석
     You attempted to access an unassigned field symbol
     (data segment 75).

     This error may occur if
     - You address a typed field symbol before it has been set with
       ASSIGN
     - You address a field symbol that pointed to the line of an
       internal table that was deleted
     - You address a field symbol that was previously reset using
       UNASSIGN or that pointed to a local field that no
       longer exists
     - You address a global function interface, although the
       respective function module is not active - that is, is
       not in the list of active calls. The list of active calls
       can be taken from this short dump.

고수님 부탁드립니다. .어디슬 수정해야 하는것인지요..

혹시 라인 길이가 72 라인이 넘어서 그러는건가 해서 check 해봤는데 72라인이 넘는건 없거든요...

부탁드립니다...