Often this error comes on running next js after creating the project. In this blog, I am telling you an easy way to solve this error. This error comes due to the missing of the .next folder. Which can be created by a command.
First of all, you go to the project directory where you have created your next project.
Run this command
npm install next react react-dom # or yarn add next react react-dom
After successfully install all files run this command.
npm run dev
http://localhost:3000 to view your application.
I hope this will helps you.