Can't host React app on Google App Engine - node.js

Question

I'm a big Google App Engine newbie here. Struggling to deploy my first app onto the platform. When I try to, I get the following error message:
The command '/bin/sh -c npm install --unsafe-perm || ((if [ -f npm-debug.log ]; then cat npm-debug.log; fi) && false)' returned a non-zero code: 1
ERROR
ERROR: build step "gcr.io/cloud-builders/docker#sha256:b085f9e5583624eace9c9ba45097afc12123cf5f145703c693c32264c90bbbe0" failed: exit status 1
ERROR: gcloud crashed (AttributeError): 'module' object has no attribute 'HttpErrorPayload'
app.yaml:
env: flex
runtime: nodejs
package.json:
{
"name": "react-boilerplate",
"version": "1.0.0",
"description": "Minimal boilerplate for react",
"main": "index.js",
"scripts": {
"dev": "webpack-dev-server --progress --inline --colors --hot --config ./webpack.config.js",
"postinstall": "NODE_ENV='production' webpack -p",
"start": "node server.js",
"test": "echo \"Error: no test specified\" && exit 1"
},
"author": "",
"license": "ISC",
"babel": {
"presets": [
"es2015",
"react",
"stage-2"
]
},
"engines": {
"node": "6.11.0",
"npm": "3.10.10"
},
"devDependencies": {
"babel-core": "^6.24.1",
"babel-loader": "^7.0.0",
"babel-preset-es2015": "^6.24.1",
"babel-preset-react": "^6.24.1",
"babel-preset-stage-2": "^6.24.1",
"css-loader": "^0.28.0",
"node-sass": "^4.5.2",
"sass-loader": "^6.0.5",
"style-loader": "^0.16.1",
"webpack": "^3.0.0",
"webpack-dev-server": "^2.4.5"
},
"dependencies": {
"axios": "^0.16.2",
"d3": "^4.9.1",
"react": "^15.5.4",
"react-dom": "^15.5.4",
"react-redux": "^5.0.5",
"redux": "^3.7.1",
"redux-thunk": "^2.2.0"
}
}
server.js:
const express = require('express');
const path = require('path');
const port = process.env.PORT || 8080;
const app = express();
app.use(express.static(__dirname));
app.get('*', (req, res) => {
res.sendFile(path.resolve(__dirname, 'index.html'));
});
app.listen(port);
console.log('Server started');
This is what my folder directory looks like:
Am I doing right?

Answer 1

Was able to solve this by moving all the modules in devDependencies to dependencies!