• File "C:\ProgramData\Miniconda3\lib\site-packages\flask\app.py", line 2095, in __call__

      def __call__(self, environ: dict, start_response: t.Callable) -> t.Any:

          """The WSGI server calls the Flask application object as the

          WSGI application. This calls :meth:`wsgi_app`, which can be

          wrapped to apply middleware.

          """

          return self.wsgi_app(environ, start_response)

• File "C:\ProgramData\Miniconda3\lib\site-packages\flask\app.py", line 2080, in wsgi_app

              try:

                  ctx.push()

                  response = self.full_dispatch_request()

              except Exception as e:

                  error = e

                  response = self.handle_exception(e)

              except:  # noqa: B001

                  error = sys.exc_info()[1]

                  raise

              return response(environ, start_response)

          finally:

• File "C:\ProgramData\Miniconda3\lib\site-packages\flask\app.py", line 2077, in wsgi_app

          ctx = self.request_context(environ)

          error: t.Optional[BaseException] = None

          try:

              try:

                  ctx.push()

                  response = self.full_dispatch_request()

              except Exception as e:

                  error = e

                  response = self.handle_exception(e)

              except:  # noqa: B001

                  error = sys.exc_info()[1]

• File "C:\ProgramData\Miniconda3\lib\site-packages\flask\app.py", line 1526, in full_dispatch_request

              rv = self.preprocess_request()

              if rv is None:

                  rv = self.dispatch_request()

          except Exception as e:

              rv = self.handle_user_exception(e)

          return self.finalize_request(rv)

      def finalize_request(

          self,

          rv: t.Union[ResponseReturnValue, HTTPException],

          from_error_handler: bool = False,

• File "C:\ProgramData\Miniconda3\lib\site-packages\flask\app.py", line 1545, in finalize_request

          with the `from_error_handler` flag.  If enabled, failures in

          response processing will be logged and otherwise ignored.

          :internal:

          """

          response = self.make_response(rv)

          try:

              response = self.process_response(response)

              request_finished.send(self, response=response)

          except Exception:

              if not from_error_handler:

• File "C:\ProgramData\Miniconda3\lib\site-packages\flask\app.py", line 1734, in make_response

                          " response. The return type must be a string,"

                          " dict, tuple, Response instance, or WSGI"

                          f" callable, but it was a {type(rv).__name__}."

                      ).with_traceback(sys.exc_info()[2]) from None

              else:

                  raise TypeError(

                      "The view function did not return a valid"

                      " response. The return type must be a string,"

                      " dict, tuple, Response instance, or WSGI"

                      f" callable, but it was a {type(rv).__name__}."

                  )

TypeError: The view function did not return a valid response. The return type must be a string, dict, tuple, Response instance, or WSGI callable, but it was a list.

• File "C:\ProgramData\Miniconda3\lib\site-packages\flask\app.py", line 2095, in __call__

      def __call__(self, environ: dict, start_response: t.Callable) -> t.Any:

          """The WSGI server calls the Flask application object as the

          WSGI application. This calls :meth:`wsgi_app`, which can be

          wrapped to apply middleware.

          """

          return self.wsgi_app(environ, start_response)

• File "C:\ProgramData\Miniconda3\lib\site-packages\flask\app.py", line 2080, in wsgi_app

              try:

                  ctx.push()

                  response = self.full_dispatch_request()

              except Exception as e:

                  error = e

                  response = self.handle_exception(e)

              except:  # noqa: B001

                  error = sys.exc_info()[1]

                  raise

              return response(environ, start_response)

          finally:

• File "C:\ProgramData\Miniconda3\lib\site-packages\flask\app.py", line 2077, in wsgi_app

          ctx = self.request_context(environ)

          error: t.Optional[BaseException] = None

          try:

              try:

                  ctx.push()

                  response = self.full_dispatch_request()

              except Exception as e:

                  error = e

                  response = self.handle_exception(e)

              except:  # noqa: B001

                  error = sys.exc_info()[1]

• File "C:\ProgramData\Miniconda3\lib\site-packages\flask\app.py", line 1526, in full_dispatch_request

              rv = self.preprocess_request()

              if rv is None:

                  rv = self.dispatch_request()

          except Exception as e:

              rv = self.handle_user_exception(e)

          return self.finalize_request(rv)

      def finalize_request(

          self,

          rv: t.Union[ResponseReturnValue, HTTPException],

          from_error_handler: bool = False,

• File "C:\ProgramData\Miniconda3\lib\site-packages\flask\app.py", line 1545, in finalize_request

          with the `from_error_handler` flag.  If enabled, failures in

          response processing will be logged and otherwise ignored.

          :internal:

          """

          response = self.make_response(rv)

          try:

              response = self.process_response(response)

              request_finished.send(self, response=response)

          except Exception:

              if not from_error_handler:

• File "C:\ProgramData\Miniconda3\lib\site-packages\flask\app.py", line 1734, in make_response

                          " response. The return type must be a string,"

                          " dict, tuple, Response instance, or WSGI"

                          f" callable, but it was a {type(rv).__name__}."

                      ).with_traceback(sys.exc_info()[2]) from None

              else:

                  raise TypeError(

                      "The view function did not return a valid"

                      " response. The return type must be a string,"

                      " dict, tuple, Response instance, or WSGI"

                      f" callable, but it was a {type(rv).__name__}."

                  )

TypeError: The view function did not return a valid response. The return type must be a string, dict, tuple, Response instance, or WSGI callable, but it was a list.