Werkzeug Internal Server Error

traceback.txt

Traceback (most recent call last):
  File "C:\Users\Baxter\jwitter\lib\site-packages\flask\app.py", line 1836, in __call__
    return self.wsgi_app(environ, start_response)
  File "C:\Users\Baxter\jwitter\lib\site-packages\flask\app.py", line 1820, in wsgi_app
    response = self.make_response(self.handle_exception(e))
  File "C:\Users\Baxter\jwitter\lib\site-packages\flask\app.py", line 1403, in handle_exception
    reraise(exc_type, exc_value, tb)
  File "C:\Users\Baxter\jwitter\lib\site-packages\flask\_compat.py", line 33, in reraise
    raise value
  File "C:\Users\Baxter\jwitter\lib\site-packages\flask\app.py", line 1817, in wsgi_app
    response = self.full_dispatch_request()
  File "C:\Users\Baxter\jwitter\lib\site-packages\flask\app.py", line 1477, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "C:\Users\Baxter\jwitter\lib\site-packages\flask\app.py", line 1381, in handle_user_exception
    reraise(exc_type, exc_value, tb)
  File "C:\Users\Baxter\jwitter\lib\site-packages\flask\_compat.py", line 33, in reraise
    raise value
  File "C:\Users\Baxter\jwitter\lib\site-packages\flask\app.py", line 1475, in full_dispatch_request
    rv = self.dispatch_request()
  File "C:\Users\Baxter\jwitter\lib\site-packages\flask\app.py", line 1461, in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File "C:\Users\Baxter\PycharmProjects\untitled\test.py", line 24, in index
    data = get_saved_data("session")
  File "C:\Users\Baxter\PycharmProjects\untitled\test.py", line 6, in get_saved_data
    data = json.loads(request.cookies.get(key))
  File "c:\users\baxter\anaconda3\Lib\json\__init__.py", line 318, in loads
    return _default_decoder.decode(s)
  File "c:\users\baxter\anaconda3\Lib\json\decoder.py", line 343, in decode
    obj, end = self.raw_decode(s, idx=_w(s, 0).end())
  File "c:\users\baxter\anaconda3\Lib\json\decoder.py", line 361, in raw_decode
    raise ValueError(errmsg("Expecting value", s, err.value)) from None
ValueError: Expecting value: line 1 column 1 (char 0)