I have a problem with the Flutter SDK. I am setting up Flutter through the FlutterFlow app on windows. On the "Doctor Output" step, I encountered the problem "Some Android licenses are not accepted. To resolve this, run: flutter doctor --android-licenses". But, when I type this into cmd as written here, I get the error, ‘flutter’ is not recognized as an internal or external command. In the first step I seemed to have no problem installing the Flutter SDK and moving on, but apparently not? I'm confused.