Well, I didn't try a clean load first - I very much apologize about that. This is my second take at the COBOL parser - the first one had rather too much logic in the AST nodes. Unfortunately, just a few remainders were left in the package the cause loading to fail (although you should just be able to continue past the error).
Or, now, load the latest version, and also load the Cbc compatibility package (in the same repository) that includes a handful of methods that I used in the code, but are not rightly part of the parser itself.
This should now load and parse files in the latest Moose 5 image.
-cbc