[Question][Hw6] Problem of module String in campaign.ml

[ahnjonggun]

Name: Jaewoo Ahn

When I am using String module in src/campaign.ml like String.length or String.filter, it outputs an error as

The module String is an alias for module Stdlib__String, which is missing(ocamllsp)

module String doesn't have any problems in skeleton codes like fuzzer.ml and coverage.ml.

student@cs348-79:~/cs348-2023-spring-hw6-s20200366/test$ opam switch
# switch compiler description
default ocaml.4.08.1 default
→ prosyslab-classroom-4.13.1 ocaml-option-flambda.1,ocaml-variants.4.13.1+options prosyslab-classroom-4.13.1
student@cs348-79:~/cs348-2023-spring-hw6-s20200366$ ls ~/.opam/prosyslab-classroom-4.13.1/lib/ocaml/stdlib__String*
/home/student/.opam/prosyslab-classroom-4.13.1/lib/ocaml/stdlib__String.cmi
/home/student/.opam/prosyslab-classroom-4.13.1/lib/ocaml/stdlib__String.cmt
/home/student/.opam/prosyslab-classroom-4.13.1/lib/ocaml/stdlib__String.cmti
/home/student/.opam/prosyslab-classroom-4.13.1/lib/ocaml/stdlib__String.cmx
/home/student/.opam/prosyslab-classroom-4.13.1/lib/ocaml/stdlib__StringLabels.cmi
/home/student/.opam/prosyslab-classroom-4.13.1/lib/ocaml/stdlib__StringLabels.cmt
/home/student/.opam/prosyslab-classroom-4.13.1/lib/ocaml/stdlib__StringLabels.cmti
/home/student/.opam/prosyslab-classroom-4.13.1/lib/ocaml/stdlib__StringLabels.cmx
`

I did like above after looking at https://discuss.ocaml.org/t/the-module-bytes-is-an-alias-for-module-stdlib-bytes-which-is-missing-error-in-ocaml-4-14/11821
but all my files seem to be in place.
What should I do to solve this problem?
I am using the ssh remote server via vscode.

Thank you

[yeonhee-ryou]

If you are working on the KCLOUD VM, you don't need to change the opam switch. Check your source code and the standard String module document again.