React app won't deploy

18:43:58.420    Preparing [email protected] for immediate activation...
18:43:59.112    Installing project dependencies: yarn --pure-lockfile --no-progress --emoji false
18:43:59.391    Corepack is about to download https://repo.yarnpkg.com/4.5.1/packages/yarnpkg-cli/bin/yarn.js.
18:43:59.831    Unknown Syntax Error: Unsupported option name ("--pure-lockfile").

18:43:58.420    Preparing [email protected] for immediate activation...
18:43:59.112    Installing project dependencies: yarn --pure-lockfile --no-progress --emoji false
18:43:59.391    Corepack is about to download https://repo.yarnpkg.com/4.5.1/packages/yarnpkg-cli/bin/yarn.js.
18:43:59.831    Unknown Syntax Error: Unsupported option name ("--pure-lockfile").