500: Internal Server Error

Traceback

Traceback (most recent call last):
  File "/home/odoo/ce/13.0/odoo/addons/base/models/ir_http.py", line 234, in _dispatch
    result = request.dispatch()
  File "/home/odoo/ce/13.0/odoo/http.py", line 809, in dispatch
    r = self._call_function(**self.params)
  File "/home/odoo/ce/13.0/odoo/http.py", line 350, in _call_function
    return checked_call(self.db, *args, **kwargs)
  File "/home/odoo/ce/13.0/odoo/service/model.py", line 94, in wrapper
    return f(dbname, *args, **kwargs)
  File "/home/odoo/ce/13.0/odoo/http.py", line 339, in checked_call
    result = self.endpoint(*a, **kw)
  File "/home/odoo/ce/13.0/odoo/http.py", line 915, in __call__
    return self.method(*args, **kw)
  File "/home/odoo/ce/13.0/odoo/http.py", line 515, in response_wrap
    response = f(*args, **kw)
  File "/home/odoo/theme-demo/13.0/alan/atharva_theme_general/controllers/main.py", line 55, in shop
    raise NotFound()
NameError: name 'NotFound' is not defined