NameError: name '_validate_student_' is not defined

I recently imported the LMS project from GitHub. The project is mainly created in Flask. I installed all the required modules and then trying to run the application. I seted the Flask to >>set FLASK_APP=run.py. On flask_run, it gives the following error. I'm not getting how to fix it. Looking forward for suggestions to resolve this error.

• Serving Flask app 'run' (lazy loading)
• Environment: production WARNING: This is a development server. Do not use it in a production deployment. Use a production WSGI server instead.
• Debug mode: off

Traceback (most recent call last):
  File "c:\users\ali\appdata\local\programs\python\python38-32\lib\runpy.py", line 193, in _run_module_as_main
    return _run_code(code, main_globals, None,
  File "c:\users\ali\appdata\local\programs\python\python38-32\lib\runpy.py", line 86, in _run_code
    exec(code, run_globals)
  File "C:\Users\Ali\AppData\Local\Programs\Python\Python38-32\Scripts\flask.exe\__main__.py", line 7, in <module>
  File "c:\users\ali\appdata\local\programs\python\python38-32\lib\site-packages\flask\cli.py", line 990, in main
    cli.main(args=sys.argv[1:])
  File "c:\users\ali\appdata\local\programs\python\python38-32\lib\site-packages\flask\cli.py", line 596, in main
    return super().main(*args, **kwargs)
  File "c:\users\ali\appdata\local\programs\python\python38-32\lib\site-packages\click\core.py", line 1062, in main
    rv = self.invoke(ctx)
  File "c:\users\ali\appdata\local\programs\python\python38-32\lib\site-packages\click\core.py", line 1668, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "c:\users\ali\appdata\local\programs\python\python38-32\lib\site-packages\click\core.py", line 1404, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "c:\users\ali\appdata\local\programs\python\python38-32\lib\site-packages\click\core.py", line 763, in invoke
    return __callback(*args, **kwargs)
  File "c:\users\ali\appdata\local\programs\python\python38-32\lib\site-packages\click\decorators.py", line 84, in new_func
    return ctx.invoke(f, obj, *args, **kwargs)
  File "c:\users\ali\appdata\local\programs\python\python38-32\lib\site-packages\click\core.py", line 763, in invoke
    return __callback(*args, **kwargs)
  File "c:\users\ali\appdata\local\programs\python\python38-32\lib\site-packages\flask\cli.py", line 845, in run_command
    app = DispatchingApp(info.load_app, use_eager_loading=eager_loading)
  File "c:\users\ali\appdata\local\programs\python\python38-32\lib\site-packages\flask\cli.py", line 321, in __init__
    self._load_unlocked()
  File "c:\users\ali\appdata\local\programs\python\python38-32\lib\site-packages\flask\cli.py", line 346, in _load_unlocked
    self._app = rv = self.loader()
  File "c:\users\ali\appdata\local\programs\python\python38-32\lib\site-packages\flask\cli.py", line 402, in load_app
    app = locate_app(self, import_name, name)
  File "c:\users\ali\appdata\local\programs\python\python38-32\lib\site-packages\flask\cli.py", line 256, in locate_app
    __import__(module_name)
  File "C:\Users\Ali\Documents\flask_app\run.py", line 19, in <module>
    from application import app
  File "C:\Users\Ali\Documents\flask_app\application\__init__.py", line 6, in <module>
    import application.students
  File "C:\Users\Ali\Documents\flask_app\application\students.py", line 9, in <module>
    @validate_student
NameError: name 'validate_student' is not defined

C:\Users\Ali\Documents\flask_app>flask run
 * Serving Flask app 'run' (lazy loading)
 * Environment: production
   WARNING: This is a development server. Do not use it in a production deployment.
   Use a production WSGI server instead.
 * Debug mode: off
Traceback (most recent call last):
  File "c:\users\ali\appdata\local\programs\python\python38-32\lib\runpy.py", line 193, in _run_module_as_main
    return _run_code(code, main_globals, None,
  File "c:\users\ali\appdata\local\programs\python\python38-32\lib\runpy.py", line 86, in _run_code
    exec(code, run_globals)
  File "C:\Users\Ali\AppData\Local\Programs\Python\Python38-32\Scripts\flask.exe\__main__.py", line 7, in <module>
  File "c:\users\ali\appdata\local\programs\python\python38-32\lib\site-packages\flask\cli.py", line 990, in main
    cli.main(args=sys.argv[1:])
  File "c:\users\ali\appdata\local\programs\python\python38-32\lib\site-packages\flask\cli.py", line 596, in main
    return super().main(*args, **kwargs)
  File "c:\users\ali\appdata\local\programs\python\python38-32\lib\site-packages\click\core.py", line 1062, in main
    rv = self.invoke(ctx)
  File "c:\users\ali\appdata\local\programs\python\python38-32\lib\site-packages\click\core.py", line 1668, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "c:\users\ali\appdata\local\programs\python\python38-32\lib\site-packages\click\core.py", line 1404, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "c:\users\ali\appdata\local\programs\python\python38-32\lib\site-packages\click\core.py", line 763, in invoke
    return __callback(*args, **kwargs)
  File "c:\users\ali\appdata\local\programs\python\python38-32\lib\site-packages\click\decorators.py", line 84, in new_func
    return ctx.invoke(f, obj, *args, **kwargs)
  File "c:\users\ali\appdata\local\programs\python\python38-32\lib\site-packages\click\core.py", line 763, in invoke
    return __callback(*args, **kwargs)
  File "c:\users\ali\appdata\local\programs\python\python38-32\lib\site-packages\flask\cli.py", line 845, in run_command
    app = DispatchingApp(info.load_app, use_eager_loading=eager_loading)
  File "c:\users\ali\appdata\local\programs\python\python38-32\lib\site-packages\flask\cli.py", line 321, in __init__
    self._load_unlocked()
  File "c:\users\ali\appdata\local\programs\python\python38-32\lib\site-packages\flask\cli.py", line 346, in _load_unlocked
    self._app = rv = self.loader()
  File "c:\users\ali\appdata\local\programs\python\python38-32\lib\site-packages\flask\cli.py", line 402, in load_app
    app = locate_app(self, import_name, name)
  File "c:\users\ali\appdata\local\programs\python\python38-32\lib\site-packages\flask\cli.py", line 256, in locate_app
    __import__(module_name)
  File "C:\Users\Ali\Documents\flask_app\run.py", line 19, in <module>
    from application import app
  File "C:\Users\Ali\Documents\flask_app\application\__init__.py", line 6, in <module>
    import application.students
  File "C:\Users\Ali\Documents\flask_app\application\students.py", line 9, in <module>
    @validate_student
NameError: name 'validate_student' is not defined

C:\Users\Ali\Documents\flask_app>flask run
 * Serving Flask app 'run' (lazy loading)
 * Environment: production
   WARNING: This is a development server. Do not use it in a production deployment.
   Use a production WSGI server instead.
 * Debug mode: off
Traceback (most recent call last):
  File "c:\users\ali\appdata\local\programs\python\python38-32\lib\runpy.py", line 193, in _run_module_as_main
    return _run_code(code, main_globals, None,
  File "c:\users\ali\appdata\local\programs\python\python38-32\lib\runpy.py", line 86, in _run_code
    exec(code, run_globals)
  File "C:\Users\Ali\AppData\Local\Programs\Python\Python38-32\Scripts\flask.exe\__main__.py", line 7, in <module>
  File "c:\users\ali\appdata\local\programs\python\python38-32\lib\site-packages\flask\cli.py", line 990, in main
    cli.main(args=sys.argv[1:])
  File "c:\users\ali\appdata\local\programs\python\python38-32\lib\site-packages\flask\cli.py", line 596, in main
    return super().main(*args, **kwargs)
  File "c:\users\ali\appdata\local\programs\python\python38-32\lib\site-packages\click\core.py", line 1062, in main
    rv = self.invoke(ctx)
  File "c:\users\ali\appdata\local\programs\python\python38-32\lib\site-packages\click\core.py", line 1668, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "c:\users\ali\appdata\local\programs\python\python38-32\lib\site-packages\click\core.py", line 1404, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "c:\users\ali\appdata\local\programs\python\python38-32\lib\site-packages\click\core.py", line 763, in invoke
    return __callback(*args, **kwargs)
  File "c:\users\ali\appdata\local\programs\python\python38-32\lib\site-packages\click\decorators.py", line 84, in new_func
    return ctx.invoke(f, obj, *args, **kwargs)
  File "c:\users\ali\appdata\local\programs\python\python38-32\lib\site-packages\click\core.py", line 763, in invoke
    return __callback(*args, **kwargs)
  File "c:\users\ali\appdata\local\programs\python\python38-32\lib\site-packages\flask\cli.py", line 845, in run_command
    app = DispatchingApp(info.load_app, use_eager_loading=eager_loading)
  File "c:\users\ali\appdata\local\programs\python\python38-32\lib\site-packages\flask\cli.py", line 321, in __init__
    self._load_unlocked()
  File "c:\users\ali\appdata\local\programs\python\python38-32\lib\site-packages\flask\cli.py", line 346, in _load_unlocked
    self._app = rv = self.loader()
  File "c:\users\ali\appdata\local\programs\python\python38-32\lib\site-packages\flask\cli.py", line 402, in load_app
    app = locate_app(self, import_name, name)
  File "c:\users\ali\appdata\local\programs\python\python38-32\lib\site-packages\flask\cli.py", line 256, in locate_app
    __import__(module_name)
  File "C:\Users\Ali\Documents\flask_app\run.py", line 19, in <module>
    from application import app
  File "C:\Users\Ali\Documents\flask_app\application\__init__.py", line 6, in <module>
    import application.students
  File "C:\Users\Ali\Documents\flask_app\application\students.py", line 7, in <module>
    app = Flask(_validate_student_)
NameError: name '_validate_student_' is not defined

My Code Is:

from application import app
from flask import render_template, session, redirect, request, flash, escape
from functools import wraps
from flask import Flask
from helper_functions import *

app = Flask(_validate_student_)
@app.route('/students/')
@validate_student
def student_home():
    return render_template('/students/index.html', classes=getStudentClasses())

@app.route('/students/classes/')
@validate_student
def student_classes_home():
    return render_template('/students/classes.html', classes=getStudentClasses())

@app.route('/students/classes/join/', methods=['POST'])
@validate_student
def student_class_join():
    insert_db("INSERT INTO roster (people_id, class_id) VALUES (?, ?);", [session['id'], request.form['id']])
    flash("You joined the class with an id of %s" %(request.form['id']))
    return redirect("/students/classes")