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Flutter App Running Error: Dart can not be opened, Developer can not be verified after upgrading to Catalina

Tags:

android-studio

flutter

dart

macos-catalina

flutter-dependencies

I was using the latest version of Android Studio IDE for creating flutter apps. But when I upgraded from Mojave to Catalina and tried to open my flutter code on IDE it gave me an error saying:

Dart can not be opened because the Developer can not be verified

What is the reason behind the error and how can I solve the issue?

Do I have to install flutter and relative development tools from scratch again or is there any other way to resolve the issue?

enter image description here

like image 379
MD Sazid Hasan Dip Avatar asked Oct 15 '19 05:10

MD Sazid Hasan Dip

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Requirements to create Flutter projectJava 11 JDK installed and set in system environment variables. Flutter and Dart extension installed. Connected Device with laptop for run and test flutter applications.

Is Flutter built on Dart?

Flutter is built with C, C++, Dart, and Skia (a 2D rendering engine).

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Flutter is an Open-Source UI SDK developed by Google. It allows the development of iOS/Android apps and uses Dart as the programming language. Dart is an Open-Source, client-side programming language. It is easy to learn, stable, and creates high-performance applications.

Why can't I run a dart app in flutter?

Show activity on this post. You are getting those errors because your IDE is executing main.dart as a simple dart application and not as a Flutter application. As answered by salihguler, if you are using Android SDK then choose the main.dart file with Flutter Icon beside it and not the one with Dart Icon and the project should work just fine.

How to debug a Flutter App in Android Studio?

As answered by salihguler, if you are using Android SDK then choose the main.dart file with Flutter Icon beside it and not the one with Dart Icon and the project should work just fine. If you are using VS Code then instead of hitting Run ( Ctrl + Alt + N) go to Debug -> Start Debugging option or simply press F5 and errors will be gone.

Why am I getting “Dart not working” error in IDE?

You are getting those errors because your IDE is executing main.dart as a simple dart application and not as a Flutter application. As answered by salihguler, if you are using Android SDK then choose the main.dart file with Flutter Icon beside it and not the one with Dart Icon and the project should work just fine.

How to fix error'Dart SDK is not found in specified location'?

If you are using Android Studio and getting this message ' Error: Dart SDK is not found in specified location ', My fix was this. Go to File/Settings or Ctrl+Alt+S to bring up the settings window. For the Path Dart SDK path: enter the location where you are storing the flutter directory.

2 Answers

Do this steps and repeat until allow all you need and stop notifications. Solve for me.

  1. On your Mac, choose Apple menu > System Preferences, click Security & Privacy, then click General.
  2. Click the lock icon to unlock it, then enter an administrator name and password.
  3. Select the sources from which you’ll allow software to be installed: There should be a button that says "Allow anyway". If not make sure you've cancelled the error dialog.
like image 78
Álvaro Menezes Avatar answered Oct 20 '22 23:10

Álvaro Menezes

usually you will not be allowed to install the applications dowloaded form other sources .... you need to first give permissions in the system Preferences

  1. apple-icon on left top corner > System Preferences > click Security & Privacy > then click General... now Click the lock icon to unlock it ... 2.now, you will be shown with below attached image ... click allow anyway .. enter image description here
  2. now retry installing ... you are good to go...
like image 38
Aravind Siruvuru Avatar answered Oct 20 '22 23:10

Aravind Siruvuru
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