Field catalog not found in SAP ABAP

When we are Displaying the ALV GRID using SET_TABLE_FOR_FIRST_DISPLAY ,Some times we may get error message like 

'FIELD CATALOG NOT FOUND".

If you are using the below Function Module to create fieldcatalog, then make sure that the ZSTRUCT should be DataDictionary Object.

If you Create ZSTRUCT as local structure by using TYPES statement,You will get the error.

FM Signature:

CALL FUNCTION 'LVC_FIELDCATALOG_MERGE'

EXPORTING

I_STRUCTURE_NAME = 'ZSTRUCT'    "DDIC object

I_INTERNAL_TABNAME = ITAB_OUTPUT   "Interanal table based on your requirement

CHANGING

CT_FIELDCAT = ITAB_FIELDCAT  "Field catalog ref to  lvc_s_fcat

EXCEPTIONS

INCONSISTENT_INTERFACE = 1

PROGRAM_ERROR = 2

OTHERS = 3.