Build Error

[jdwoolc]

I just tried to use this devcontainer -- I'm not deeply familiar with ocaml and am looking for a container like this that I could tinker around with to learn the language.

Building on Windows inside VSCode with Docker Desktop 3.5.1 fails with the following error:

#7 38.65 [typerep.v0.13.0] downloaded from https://ocaml.janestreet.com/ocaml-core/v0.13/files/typerep-v0.13.0.tar.gz
#7 38.88 [tyxml.4.4.0] downloaded from https://github.com/ocsigen/tyxml/releases/download/4.4.0/tyxml-4.4.0.tbz
#7 39.13 [uchar.0.0.2] downloaded from https://github.com/ocaml/uchar/releases/download/v0.0.2/uchar-0.0.2.tbz
#7 39.63 [topkg.1.0.1] downloaded from http://erratique.ch/software/topkg/releases/topkg-1.0.1.tbz
#7 39.79 [uuseg.13.0.0] downloaded from https://erratique.ch/software/uuseg/releases/uuseg-13.0.0.tbz
#7 40.08 [variantslib.v0.13.0] downloaded from https://ocaml.janestreet.com/ocaml-core/v0.13/files/variantslib-v0.13.0.tar.gz
#7 40.70 [uutf.1.0.2] downloaded from http://erratique.ch/software/uutf/releases/uutf-1.0.2.tbz
#7 41.27 [uucp.13.0.0] downloaded from https://erratique.ch/software/uucp/releases/uucp-13.0.0.tbz
#7 42.02 [ERROR] The sources of the following couldn't be obtained, aborting:
#7 42.02           - fix.20200131: Bad checksum
#7 42.02           - menhir.20200624: Bad checksum
#7 42.02           - menhirLib.20200624: Bad checksum
#7 42.02           - menhirSdk.20200624: Bad checksum
#7 42.02
------
executor failed running [/bin/sh -c opam update &&   opam install   base core_kernel   ounit qcheck dune   ocamlformat]: exit code: 40