Tengo un problema con mi aplicación MERN-Stack que muestra contenido en blanco en el navegador a pesar de que el front-end y el back-end se ejecutan sin errores.

En el navegador, aparecen dos errores a través de la inspección;

1. Error de sintaxis no detectado: token inesperado '<' en main.b4d4fd26.js:1

2. Manifiesto: Línea: 1, columna: 1, Error de sintaxis en manifest.json:1

¿Cuál sería la solución a esto?

Servidor:

 const express = require("express"); const { ApolloServer } = require("apollo-server-express"); const path = require("path"); // require("dotenv").config(); require("dotenv").config({ path: path.resolve(__dirname, ".env") }); const { typeDefs, resolvers } = require("./schemas"); const { authMiddleware } = require("./utils/auth"); const db = require("./config/connection"); const PORT = process.env.PORT || 5000; const app = express(); const server = new ApolloServer({ typeDefs, resolvers, context: authMiddleware, // These two lines below enable the playground when deployed to heroku. You can remove them if you don't want this functionality introspection: true, playground: true, }); server.applyMiddleware({ app }); app.use(express.urlencoded({ extended: false })); app.use(express.json()); if (process.env.NODE_ENV === "production") { app.use(express.static(path.join(__dirname, "../client/build"))); } app.get("*", (req, res) => { res.sendFile(path.join(__dirname, "../client/build/index.html")); }); db.once("open", () => { app.listen(PORT, () => { console.log(`Server running on port http://localhost:${PORT}`); console.log(`Use GraphQL at http://localhost:${PORT}${server.graphqlPath}`); }); });

Archivo Manifest.json:

 { "short_name": "React App", "name": "Create React App Sample", "icons": [ { "src": "favicon.ico", "sizes": "64x64 32x32 24x24 16x16", "type": "image/x-icon" }, { "src": "logo192.png", "type": "image/png", "sizes": "192x192" }, { "src": "logo512.png", "type": "image/png", "sizes": "512x512" } ], "start_url": ".", "display": "standalone", "theme_color": "#000000", "background_color": "#ffffff" }