How to deploy AngularJS in GCP? - node.js

Question

I'm trying to deploy my AngularJS application in a gcloud free trial(GCP). But I'm getting the next error:
Error: Server Error
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I setup everithing as a nodejs application to deploy. I also added the app.yaml that is necessary.
Here is my app.yaml:
runtime: nodejs12
instance_class: F2
the package.json:
{
"name": "myApp",
"private": true,
"version": "0.0.1",
"description": "Assignment: Get nearest charging stations for a specific location.",
"repository": "",
"license": "MIT",
"dependencies": {
"angular": "^1.7.5",
"angular-loader": "^1.7.5",
"angular-route": "^1.7.5",
"html5-boilerplate": "0.0.1"
},
"devDependencies": {
"angular-mocks": "^1.7.5",
"cpx": "^1.5.0",
"http-server": "^0.11.1",
"jasmine-core": "^3.3.0",
"karma": "^3.1.1",
"karma-chrome-launcher": "^2.2.0",
"karma-firefox-launcher": "^1.1.0",
"karma-jasmine": "^1.1.2",
"protractor": "^5.4.1"
},
"scripts": {
"update-deps": "npm update",
"postupdate-deps": "npm run copy-libs",
"copy-libs": "cpx \"node_modules/{angular,angular-*,html5-boilerplate/dist}/**/*\" app/lib -C",
"prestart": "npm install",
"start": "http-server -a localhost -p 8000 -c-1 ./app",
"pretest": "npm install",
"test": "karma start karma.conf.js",
"test-single-run": "npm test -- --single-run",
"preupdate-webdriver": "npm install",
"//": "Do not install the Firefox driver to work around https://github.com/angular/webdriver-manager/issues/303.",
"update-webdriver": "webdriver-manager update --gecko false",
"preprotractor": "npm run update-webdriver",
"protractor": "protractor e2e-tests/protractor.conf.js",
"update-index-async": "node --eval \"var fs=require('fs'),indexFile='app/index-async.html',loaderFile='app/lib/angular-loader/angular-loader.min.js',loaderText=fs.readFileSync(loaderFile,'utf-8').split(/sourceMappingURL=angular-loader.min.js.map/).join('sourceMappingURL=lib/angular-loader/angular-loader.min.js.map'),indexText=fs.readFileSync(indexFile,'utf-8').split(/\\/\\/##NG_LOADER_START##[\\s\\S]*\\/\\/##NG_LOADER_END##/).join('//##NG_LOADER_START##\\n'+loaderText+' //##NG_LOADER_END##');fs.writeFileSync(indexFile,indexText);\""
}
}
And the folders: