old_contents: from flask import Blueprint
  from flask.json import jsonify
  
  errors = Blueprint('errors', __name__)
  
  
  @errors.app_errorhandler(404)
  def not_found(e):
      return jsonify({'error': 'not found'}), 404
  
new_contents: from flask import Blueprint
  from flask.json import jsonify
  from werkzeug.exceptions import BadRequest, InternalServerError
  
  errors = Blueprint('errors', __name__)
  
  
  @errors.app_errorhandler(404)
  def not_found(e):
      return generic_errors("Not found", code=404)
  
  
  @errors.app_errorhandler(500)
  def server_error(e):
      return generic_errors("server error", code=500)
  
  
  @errors.app_errorhandler(405)
  def method_error(e):
      return generic_errors("method not allowed", code=405)
  
  
  @errors.app_errorhandler(ValueError)
  def handle_invalid_arguments(e):
      errors = e.message
      return generic_errors(errors, code=400)
  
  
  def generic_errors(error, code, errors={}):
      errors["error"] = error
      response = jsonify(errors)
      response.status_code = code
      return response
  
subject: Implement Error Handlers - Add InternalServerError handler - Add BadRequest error handler