old_contents: # project/server/__init__.py
  
  
  import os
  
  from flask import Flask, render_template
  from flask_login import LoginManager
  from flask_bcrypt import Bcrypt
  from flask_debugtoolbar import DebugToolbarExtension
  from flask_bootstrap import Bootstrap
  from flask_sqlalchemy import SQLAlchemy
  from flask_migrate import Migrate
  
  
  # instantiate the extensions
  login_manager = LoginManager()
  bcrypt = Bcrypt()
  toolbar = DebugToolbarExtension()
  bootstrap = Bootstrap()
  db = SQLAlchemy()
  migrate = Migrate()
  
  
  def create_app(script_info=None):
  
      # instantiate the app
      app = Flask(
          __name__,
          template_folder='../client/templates',
          static_folder='../client/static'
      )
  
      # set config
      app_settings = os.getenv(
          'APP_SETTINGS', 'project.server.config.DevelopmentConfig')
      app.config.from_object(app_settings)
  
      # set up extensions
      login_manager.init_app(app)
      bcrypt.init_app(app)
      toolbar.init_app(app)
      bootstrap.init_app(app)
      db.init_app(app)
      migrate.init_app(app, db)
  
      # register blueprints
      from project.server.user.views import user_blueprint
      from project.server.main.views import main_blueprint
      app.register_blueprint(user_blueprint)
      app.register_blueprint(main_blueprint)
  
      # flask login
      from project.server.models import User
      login_manager.login_view = 'user.login'
      login_manager.login_message_category = 'danger'
  
      @login_manager.user_loader
      def load_user(user_id):
          return User.query.filter(User.id == int(user_id)).first()
  
          return app
  
      # error handlers
      @app.errorhandler(401)
      def unauthorized_page(error):
          return render_template('errors/401.html'), 401
  
      @app.errorhandler(403)
      def forbidden_page(error):
          return render_template('errors/403.html'), 403
  
      @app.errorhandler(404)
      def page_not_found(error):
          return render_template('errors/404.html'), 404
  
      @app.errorhandler(500)
      def server_error_page(error):
          return render_template('errors/500.html'), 500
  
      # shell context for flask cli
      app.shell_context_processor({'app': app, 'db': db})
  
      return app
  
new_contents: # project/server/__init__.py
  
  
  import os
  
  from flask import Flask, render_template
  from flask_login import LoginManager
  from flask_bcrypt import Bcrypt
  from flask_debugtoolbar import DebugToolbarExtension
  from flask_bootstrap import Bootstrap
  from flask_sqlalchemy import SQLAlchemy
  from flask_migrate import Migrate
  
  
  # instantiate the extensions
  login_manager = LoginManager()
  bcrypt = Bcrypt()
  toolbar = DebugToolbarExtension()
  bootstrap = Bootstrap()
  db = SQLAlchemy()
  migrate = Migrate()
  
  
  def create_app(script_info=None):
  
      # instantiate the app
      app = Flask(
          __name__,
          template_folder='../client/templates',
          static_folder='../client/static'
      )
  
      # set config
      app_settings = os.getenv(
          'APP_SETTINGS', 'project.server.config.DevelopmentConfig')
      app.config.from_object(app_settings)
  
      # set up extensions
      login_manager.init_app(app)
      bcrypt.init_app(app)
      toolbar.init_app(app)
      bootstrap.init_app(app)
      db.init_app(app)
      migrate.init_app(app, db)
  
      # register blueprints
      from project.server.user.views import user_blueprint
      from project.server.main.views import main_blueprint
      app.register_blueprint(user_blueprint)
      app.register_blueprint(main_blueprint)
  
      # flask login
      from project.server.models import User
      login_manager.login_view = 'user.login'
      login_manager.login_message_category = 'danger'
  
      @login_manager.user_loader
      def load_user(user_id):
          return User.query.filter(User.id == int(user_id)).first()
  
      # error handlers
      @app.errorhandler(401)
      def unauthorized_page(error):
          return render_template('errors/401.html'), 401
  
      @app.errorhandler(403)
      def forbidden_page(error):
          return render_template('errors/403.html'), 403
  
      @app.errorhandler(404)
      def page_not_found(error):
          return render_template('errors/404.html'), 404
  
      @app.errorhandler(500)
      def server_error_page(error):
          return render_template('errors/500.html'), 500
  
      # shell context for flask cli
      app.shell_context_processor({'app': app, 'db': db})
  
      return app
  
subject: remove return app