Unable to yarn install

[pokeygithub]

C:\ergogen-gui-main>yarn install
yarn install v1.22.22
[1/4] Resolving packages...
success Already up-to-date.
$ yarn run build-ergogen
yarn run v1.22.22
$ cd node_modules/ergogen && yarn install && yarn run build && cp dist/ergogen.js ../../public/dependencies/ergogen.js
[1/4] Resolving packages...
success Already up-to-date.
$ rollup -c
(node:14256) ExperimentalWarning: Importing JSON modules is an experimental feature and might change at any time
(Use node --trace-warnings ... to show where the warning was created)

src/ergogen.js → dist/ergogen.js...
created dist/ergogen.js in 936ms
'cp' is not recognized as an internal or external command,
operable program or batch file.
error Command failed with exit code 1.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.
error Command failed with exit code 1.
info Visit https://yarnpkg.com/en/docs/cli/install for documentation about this command.