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CodePudding user response：

Flutter is case sensitive, so e.g. Container is correct while container os wrong. And you've spelled package as well as material.dart wrong.

CodePudding user response：

First of all, please make a flutter project. Then You will have all the widgets available to work with and you can also run your app.

For creating project on Android Studion Go to file, create new project, choose flutter form there, give your project name and create your project.