jinja2.exceptions.UndefinedError

jinja2.exceptions.UndefinedError: 'form' is undefined

Traceback (most recent call last)

• File "C:\Users\Administrator\PycharmProjects\qa_flask2\venv\Lib\site-packages\flask\app.py", line 2464, in __call__

  return self.wsgi_app(environ, start_response)
  

• File "C:\Users\Administrator\PycharmProjects\qa_flask2\venv\Lib\site-packages\flask\app.py", line 2450, in wsgi_app

  response = self.handle_exception(e)
  

• File "C:\Users\Administrator\PycharmProjects\qa_flask2\venv\Lib\site-packages\flask\app.py", line 1867, in handle_exception

  reraise(exc_type, exc_value, tb)
  

• File "C:\Users\Administrator\PycharmProjects\qa_flask2\venv\Lib\site-packages\flask\_compat.py", line 39, in reraise

  raise value
  

• File "C:\Users\Administrator\PycharmProjects\qa_flask2\venv\Lib\site-packages\flask\app.py", line 2447, in wsgi_app

  response = self.full_dispatch_request()
  

• File "C:\Users\Administrator\PycharmProjects\qa_flask2\venv\Lib\site-packages\flask\app.py", line 1952, in full_dispatch_request

  rv = self.handle_user_exception(e)
  

• File "C:\Users\Administrator\PycharmProjects\qa_flask2\venv\Lib\site-packages\flask\app.py", line 1821, in handle_user_exception

  reraise(exc_type, exc_value, tb)
  

• File "C:\Users\Administrator\PycharmProjects\qa_flask2\venv\Lib\site-packages\flask\_compat.py", line 39, in reraise

  raise value
  

• File "C:\Users\Administrator\PycharmProjects\qa_flask2\venv\Lib\site-packages\flask\app.py", line 1950, in full_dispatch_request

  rv = self.dispatch_request()
  

• File "C:\Users\Administrator\PycharmProjects\qa_flask2\venv\Lib\site-packages\flask\app.py", line 1936, in dispatch_request

  return self.view_functions[rule.endpoint](**req.view_args)
  

• File "C:\Users\Administrator\PycharmProjects\qa_flask2\accounts\views.py", line 38, in register

  return render_template('register.html')
  

• File "C:\Users\Administrator\PycharmProjects\qa_flask2\venv\Lib\site-packages\flask\templating.py", line 137, in render_template

  return _render(
  

• File "C:\Users\Administrator\PycharmProjects\qa_flask2\venv\Lib\site-packages\flask\templating.py", line 120, in _render

  rv = template.render(context)
  

• File "C:\Users\Administrator\PycharmProjects\qa_flask2\venv\Lib\site-packages\jinja2\environment.py", line 1090, in render

  self.environment.handle_exception()
  

• File "C:\Users\Administrator\PycharmProjects\qa_flask2\venv\Lib\site-packages\jinja2\environment.py", line 832, in handle_exception

  reraise(*rewrite_traceback_stack(source=source))
  

• File "C:\Users\Administrator\PycharmProjects\qa_flask2\venv\Lib\site-packages\jinja2\_compat.py", line 28, in reraise

  raise value.with_traceback(tb)
  

• File "C:\Users\Administrator\PycharmProjects\qa_flask2\accounts\templates\register.html", line 1, in top-level template code

  {% extends 'base.html' %}
  

• File "C:\Users\Administrator\PycharmProjects\qa_flask2\templates\base.html", line 27, in top-level template code

  {% block layout %}
  

• File "C:\Users\Administrator\PycharmProjects\qa_flask2\accounts\templates\register.html", line 20, in block "layout"

  {{ form.csrf_token }}
  

• File "C:\Users\Administrator\PycharmProjects\qa_flask2\venv\Lib\site-packages\jinja2\environment.py", line 471, in getattr

  return getattr(obj, attribute)
  

jinja2.exceptions.UndefinedError: 'form' is undefined

The debugger caught an exception in your WSGI application. You can now look at the traceback which led to the error.

To switch between the interactive traceback and the plaintext one, you can click on the "Traceback" headline. From the text traceback you can also create a paste of it. For code execution mouse-over the frame you want to debug and click on the console icon on the right side.

You can execute arbitrary Python code in the stack frames and there are some extra helpers available for introspection:

• dump() shows all variables in the frame

• dump(obj) dumps all that's known about the object

•