Error in webdynpro for abap

Question

Hi Friends,
While creating a webdynpro application, i am getting the following error on the browser when i execute the application. Please help me how can i solve it.
The following error text was processed in the system SE1 : Error in module RSQL of the database interface.
The error occurred on the application server topwdserd001_SE1_51 and in the work process 0 .
The termination type was: RABAX_STATE
The ABAP call stack was:
Method: ONACTIONACTION_FIND of program /1BCWDY/3T1358J0N3JXJR8HK9WA==CP
Method: IF_WDR_VIEW_DELEGATE~WD_INVOKE_EVENT_HANDLER of program /1BCWDY/3T1358J0N3JXJR8HK9WA==CP
Method: INVOKE_EVENTHANDLER of program CL_WDR_DELEGATING_VIEW========CP
Method: IF_WDR_ACTION~FIRE of program CL_WDR_ACTION=================CP
Method: DO_HANDLE_ACTION_EVENT of program CL_WDR_WINDOW_PHASE_MODEL=====CP
Method: PROCESS_REQUEST of program CL_WDR_WINDOW_PHASE_MODEL=====CP
Method: PROCESS_REQUEST of program CL_WDR_WINDOW=================CP
Method: EXECUTE of program CL_WDR_MAIN_TASK==============CP
Method: IF_WDR_RUNTIME~EXECUTE of program CL_WDR_MAIN_TASK==============CP
Method: HANDLE_REQUEST of program CL_WDR_CLIENT_ABSTRACT_HTTP===CP

Answer 1

here is the code:
can you now see what are the errors:
method ONACTIONACTION_FIND .
     DATA LO_ND_NODE_VBAK TYPE REF TO IF_WD_CONTEXT_NODE.
     DATA LO_EL_NODE_VBAK TYPE REF TO IF_WD_CONTEXT_ELEMENT.
     DATA LS_NODE_VBAK TYPE WD_THIS->ELEMENT_NODE_VBAK.
   navigate from <CONTEXT> to <NODE_VBAK> via lead selection
     LO_ND_NODE_VBAK = WD_CONTEXT->GET_CHILD_NODE( NAME = WD_THIS->WDCTX_NODE_VBAk ).
   get element via lead selection
     LO_EL_NODE_VBAK = LO_ND_NODE_VBAK->GET_ELEMENT(  ).
   get all declared attributes
     LO_EL_NODE_VBAK->GET_STATIC_ATTRIBUTES(
       IMPORTING
         STATIC_ATTRIBUTES = LS_NODE_VBAK ).
DATA: ls_where(72) TYPE c,
      lt_where like TABLE OF ls_where,
      lt_vbak TYPE STANDARD TABLE OF vbak.
if not LS_NODE_VBAK-vbeln eq ' '.
CONCATENATE 'VBELN = ''' ls_node_vbak-vbeln '''' INTO ls_where.
APPEND ls_where to lt_where.
ENDIF.
IF NOT LS_NODE_VBAK-erdat EQ '00000000'.
CONCATENATE 'ERDAT = ''' ls_node_vbak-erdat '''' INTO ls_where.
if LS_NODE_VBAK-vbeln ne '00000000'.
  CONCATENATE 'AND' ls_where INTO ls_where SEPARATED BY space.
  ENDIF.
  APPEND ls_where to lt_where.
  ENDIF.
  SELECT VBELN ERDAT ERZET ERNAM ANGDT BNDDT AUDAT VBTYP TRVOG AUART
         AUGRU GWLDT SUBMI LIFSK FAKSK NETWR WAERK VKORG VTWEG SPART
         VKGRP VKBUR GSBER GSKST
  FROM vbak INTO TABLE lt_vbak WHERE (lt_where).
  DATA LO_ND_NODE_ALV TYPE REF TO IF_WD_CONTEXT_NODE.
  DATA LS_NODE_ALV TYPE WD_THIS->ELEMENT_NODE_ALV.
navigate from <CONTEXT> to <NODE_ALV> via lead selection
  LO_ND_NODE_ALV = WD_CONTEXT->GET_CHILD_NODE( NAME = WD_THIS->WDCTX_NODE_ALV ).
get all declared attributes
  LO_ND_NODE_ALV->bind_table( lt_vbak ).
endmethod.