Update app.py

app.py

@@ -221,7 +221,7 @@ def stop_websockets():
 
 # Start the WebSocket server 
 async def start_websockets(websocketPort):
-    uri = f'wss://localhost:{websocketPort}
+    uri = f'wss://localhost:{websocketPort}'
     global server
     # Create a WebSocket client that connects to the server      
     server = await(websockets.serve(handleWebSocket, uri))