Invalid options in vue.config.js: "devSever" is not allowed

The error message "Invalid options in vue.config.js: 'devSever' is not allowed" indicates that there is a typo in your Vue configuration file.

The correct option is "devServer" (with a capital S), not "devSever". So you need to update your configuration file to fix the typo.

Here's an example of a valid configuration file with the correct option:

module.exports = {
  devServer: {
    // Your dev server options here
  }
}

Make sure to double-check your configuration file for any other typos or syntax errors as well.