`vsync` property in TabController constructor

Add with TickerProviderStateMixin to the end of your State’s class declaration.

As Answered earlier adding the mixin, TickerProviderStateMixin should do the job or you can also use SingleTickerProviderStateMixin if you only need a Single Ticker.

But what is Does TickerProviders really do?

vsync takes a TickerProvider as an argument , that's why we use SingleTickerProviderStateMixin and as the named describes TickerProvider provides Ticker which simply means it tells our app about the Frame update(or Screen Update), so that our AnimationController can generate a new value and we can redraw the animated widget.

Simply add with TickerProviderStateMixin at the end of extends state class as follows:

class _MyAppState extends State<MyApp> with TickerProviderStateMixin {
//...
}