Can not build successfully

[LanLi2017]

When I try $ yarn build.
It just returns
yarn run v1.22.4
error Couldn't find a package.json file in "/Users/[username]"
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.

So do I need to git clone the whole project first?

[LanLi2017]

fixed by first git clone git-path, and continue inside the folder path