runApp throws an exception with stateful widget

Question

I am new to flutter and I was learning to have splashscreen in the app and then go to the new page. I added a dependency splashscreen: to my project. Since I am new I dont how to implement splashscreen and when I searched I got the solution of adding dependency to the project.

When I tried running my app I got the below error.

 I/flutter (28504): ══╡ EXCEPTION CAUGHT BY WIDGETS LIBRARY 
 ╞═══════════════════════════════════════════════════════════
 I/flutter (28504): The following assertion was thrown building 
 SplashScreen(state: _SplashScreenState#6edd2):
 I/flutter (28504): MediaQuery.of() called with a context that does not 
 contain a MediaQuery.
 I/flutter (28504): No MediaQuery ancestor could be found starting from the 
 context that was passed to MediaQuery.of().
 I/flutter (28504): This can happen because you do not have a WidgetsApp or 
 MaterialApp widget (those widgets introduce
 I/flutter (28504): a MediaQuery), or it can happen if the context you use 
 comes from a widget above those widgets.
 I/flutter (28504): The context used was:
 I/flutter (28504):   Scaffold(dirty, state: ScaffoldState#a8879(lifecycle 
 state: initialized, tickers: tracking 1
 I/flutter (28504):   ticker))

This is my pubspec.yaml

name: bmi_calculator
description: A flutter application for knowing you BMI.

version: 1.0.0+1

environment:
   sdk: ">=2.1.0 <3.0.0"

dependencies:
  flutter:
    sdk: flutter
  splashscreen:
  cupertino_icons: ^0.1.2

dev_dependencies:
  flutter_test:
    sdk: flutter

flutter:
    uses-material-design: true

My main.dart

 import 'package:flutter/material.dart';
 import 'package:splashscreen/splashscreen.dart';
 import 'package:bmi_calculator/BmiPage.dart';

 main(){
     runApp(BmiCalculator());
 }
 class BmiCalculator extends StatefulWidget{
    @override
    State<StatefulWidget> createState() {
       return BmiCalculatorstate();
    }
 }
 class BmiCalculatorstate extends State<BmiCalculator>{
     @override
     Widget build(BuildContext context) {
         return new SplashScreen(
            seconds: 10,
            navigateAfterSeconds: new BmiPage(),
            title: Text("Welcome to BMI CALCULATOR",
               style: new TextStyle(
                  fontWeight: FontWeight.bold,
                  fontSize: 10.0,
                  color: Colors.white
               ),
            ),
           backgroundColor: Colors.red,
       );
    }
 }

This is my BmiPage.dart

 import 'package:flutter/material.dart';

 class BmiPage extends StatefulWidget{
    @override
    State<StatefulWidget> createState() {
       return BmiPageState();
    }
 }
 class BmiPageState extends State<BmiPage>{
     @override
     Widget build(BuildContext context) {
         return MaterialApp(
           home: Scaffold(
             appBar: new AppBar(
                title: Text(
                  'BMI CALCULATOR',
                   style: new TextStyle(
                   color: Colors.white
             ),
         ),
         backgroundColor: Colors.red,
      ),
    ),
  );
 }
}

Why am I getting this error and how can I resolve this?

Thanks in advance.