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

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][1]][1]


[1]:

You can run this command to allow your mac/apps downloaded from anywhere

sudo spctl --master-disable

This issue can be resolved by deleting the `artefacts` directory and running `flutter doctor` once again - [More Info Here][1]


[1]:

[To see links please register here]

Disabling entire Gate Keeper is definitely not a good idea as it will result running any type of program on your system.

You can add Dart to the white list by running this in terminal:

sudo spctl --add "Path_to_flutter/bin/cache/dart-sdk/bin/dart"

You might require to reboot the system in order to apply the changes.


There are several other binaries other than Dart that may get blocked as well.

**You can run GateKeeper script to fix the issue:**

[To see links please register here]

**I have published an article with more information how to fix this:**

[To see links please register here]

*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][1]][1]
3. now retry installing ... you are good to go...



[1]:

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.

So who the hell is an "identified developer" if Google chooses not to be one? Something is wrong with this

i updated mac to Big sur and then got this problem.

Allowing dart in the security and privacy settings and then Deleting ...flutter/bin/cache folder solved it for me.

run `flutter doctor` in terminal afterwards to reinstall dart SDK

# 2022 update
The button is now at

 → System Settings → Privacy & Security → Scroll down to **Security** → `Allow anyway`

[![Allow button][1]][1]


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