'flutter material.dart and pubspec.yaml file error

I got such errors when I was developing my first flutter application. I downloaded github projects (flutter first app examples), created a new project myself. I've been searching for 2 hours and still can't solve my problems:( please help! I updated flutter from terminal, I used

flutter doctor, 
flutter upgrade
flutter clean
flutter pub get

none of my problems are solved.

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Solution 1:[1]

I think you have just downloaded the main.dart file which is not enough for the application to work it also contain other files and folders which I didn't saw in the picture

Solution 2:[2]

run flutter doctor -v and figure out if the issue is in the code or with flutter installation, ...

Solution 3:[3]

## Copy the HTTPS link from Git Code without downloading the project from GitHub, install Git Apps, Open Git Brush write Git clone Paste HTTPS Copy Link then enter. Download Git Apps Link https://git-scm.com/download/win

Follow the pictures... hopeful solve your problem.

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Solution 4:[4]

I guess this isn't a flutter project!

let's say you installed flutter correctly and you added the path.

navigate to your folder when you want to create your first flutter project and run cmd in the terminal run, this command flutter create my_first_project or any name you want.

in vs code opens the folder you've just created (my_first_project)and you're good to start.

android emulator must be installed!

Sources

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Source: Stack Overflow

Solution Source
Solution 1 Munsif Ali
Solution 2 Marcelo Cesar
Solution 3 Md Nezam Uddin
Solution 4 Ahmed Ezzeldin