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heroku cannot find index file from build folder

hosted my site on heroku, getting this error from logs

Error: ENOENT: no such file or directory, stat '/app/client/build/index.html'

my server.js

if (process.env.NODE_ENV == "production") {
  app.use(express.static("client/build"));

  const path = require("path");
  app.get("*", (req, res) => {
    res.sendFile(path.resolve(__dirname, "client", "build", "index.html"));
  });
}

package-json


 "scripts": {
    "test": "echo "Error: no test specified" && exit 1",
    "start": "node server.js",
    "heroku-postbuild": "NPM_CONFIG_PRODUCTION=false npm install --prefix client npm run build --prefix client"
  },

file paths: server>client

now maybe heroku didnt have the build folder? i doubt since i get Build succeeded! message on my terminal.

question from:https://stackoverflow.com/questions/65858767/heroku-cannot-find-index-file-from-build-folder

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