An internal error occurred during: "Generating Model". Koopa input is invalid

[Tarun Kumar]

I am not able to generate model for following COBOL code.

      IDENTIFICATION DIVISION.
      PROGRAM-ID. HELLOWORLD.
      PROCEDURE DIVISION.
          DISPLAY 'HELLO WORLD'.              
      STOP RUN.

Getting error "An internal error occurred during: "Generating Model". Koopa input is invalid"

But if we add LINKAGE SECTION it works fine, and generate Model.

      IDENTIFICATION DIVISION.
      PROGRAM-ID. HELLOWORLD.
      DATA DIVISION.                                                                                                                
      LINKAGE SECTION.                                                        
      01 TOP-LEVEL.                                                                
         05  ITEM-NUMBER               PIC 9(4).                                                            
      PROCEDURE DIVISION.
          DISPLAY 'HELLO WORLD'.              
      STOP RUN.

Please help me to Identify, why the first code is not working, as Linkage Section is not a mandatory part. Both the code are compiling successfully in AS/400 COBOL.

[Roi Mor]

Hello Tarun and welcome to our community.

Linkage section is mandatory during parsing because this is the only part which we parse.

An RPC call is exchanging input/output parameters with the linkage section.

We will add a warning instead of a fatal error.