Traceback (most recent call last): File "C:\Python\Python36\lib\site-packages\flask\app.py", line 1949, in full_dispatch_request rv = self.dispatch_request() File "C:\Python\Python36\lib\site-packages\flask\app.py", line 1925, in dispatch_request self.raise_routing_exception(req) File "C:\Python\Python36\lib\site-packages\flask\app.py", line 1907, in raise_routing_exception raise request.routing_exception File "C:\Python\Python36\lib\site-packages\flask\ctx.py", line 350, in match_request result = self.url_adapter.match(return_rule=True) File "C:\Python\Python36\lib\site-packages\werkzeug\routing.py", line 1799, in match raise NotFound() werkzeug.exceptions.NotFound: 404 Not Found: The requested URL was not found on the server. If you entered the URL manually please check your spelling and try again.