can't find the package.json file

[varndellwagglebee]

here is my structure

root/
ui/
app/
package.json

Unable to find my package.json file which is two sub directories from root.

• name: NPM or Yarn install with caching
  uses: bahmutov/npm-install@v1.6.0
  with:
  working-directory: ui/app
  useLockFile: false