errors

[Shivdoke39]

hii...im trying to use this lib for esp32 client ..i want to send inbuilt led states to the server..but getting this type of error

  client.onMessage([&](WebsocketsMessage message)
  {
   if 
   (strcmp(message.data(), "flashlight") == 0)
   {
    fl_state = fl_state ? 0 : 1;
    Serial.printf("Toggling fashlight to %u\n", fl_state);
    digitalWrite(fl, fl_state);
   }else{
    Serial.print("Got Message: ");
    Serial.println(message.data());
  });