Your project is not running except it is showing following errors

[arslankaleem7229]

lib/bloc_provider.dart:51:18: Error: The method 'inheritFromWidgetOfExactType' isn't defined for 
the class 'BuildContext'.
 - 'BuildContext' is from 'package:flutter/src/widgets/framework.dart' ('/C:/src/flutter/packages/flutter/lib/src/widgets/framework.dart').
Try correcting the name to the name of an existing method, or defining a method named 'inheritFromWidgetOfExactType'.
        (context.inheritFromWidgetOfExactType(BlocProvider) as BlocProvider);
                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
lib/bloc_provider.dart:60:18: Error: The method 'inheritFromWidgetOfExactType' isn't defined for 
the class 'BuildContext'.
 - 'BuildContext' is from 'package:flutter/src/widgets/framework.dart' ('/C:/src/flutter/packages/flutter/lib/src/widgets/framework.dart').
Try correcting the name to the name of an existing method, or defining a method named 'inheritFromWidgetOfExactType'.
        (context.inheritFromWidgetOfExactType(BlocProvider) as BlocProvider);
                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
/C:/src/flutter/.pub-cache/hosted/pub.dartlang.org/flutter_markdown-0.2.0/lib/src/builder.dart:326:49: Error: The getter 'children' isn't defined for the class 'InlineSpan'.
 - 'InlineSpan' is from 'package:flutter/src/painting/inline_span.dart' ('/C:/src/flutter/packages/flutter/lib/src/painting/inline_span.dart').
Try correcting the name to the name of an existing getter, or defining a getter or field named 'children'.
        List<TextSpan> children = previous.text.children != null
                                                ^^^^^^^^
/C:/src/flutter/.pub-cache/hosted/pub.dartlang.org/flutter_markdown-0.2.0/lib/src/builder.dart:327:41: Error: The getter 'children' isn't defined for the class 'InlineSpan'.
 - 'InlineSpan' is from 'package:flutter/src/painting/inline_span.dart' ('/C:/src/flutter/packages/flutter/lib/src/painting/inline_span.dart').
Try correcting the name to the name of an existing getter, or defining a getter or field named 'children'.
          ? new List.from(previous.text.children)
                                        ^^^^^^^^

                                                                        
FAILURE: Build failed with an exception.

* Where:
Script 'C:\src\flutter\packages\flutter_tools\gradle\flutter.gradle' line: 991

* What went wrong:
Execution failed for task ':app:compileFlutterBuildDebug'.
> Process 'command 'C:\src\flutter\bin\flutter.bat'' finished with non-zero exit value 1

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

* Get more help at https://help.gradle.org

BUILD FAILED in 40s
Running Gradle task 'assembleDebug'...
Running Gradle task 'assembleDebug'... Done                        44.6s
Exception: Gradle task assembleDebug failed with exit code 1
PS D:\Workspace\Testing\HistoryOfEverything\app>

[goodwillforyou]

replace this code context.inheritFromWidgetOfExactType(BlocProvider) as BlocProvider to context.getElementForInheritedWidgetOfExactType<BlocProvider>().widget as BlocProvider; running successfully.