Failed to start the Dart CLI isolate (null). on mac

Question

When I run flutter pub get, I am getting this error:

Failed to start the Dart CLI isolate
(null).
pub get failed (255; (null).)

In flutter doctor, there is no issue.

Answer 1

1. Go to Flutter directory where you installed the Flutter
2. Go to /bin/cache
3. remove all the items inside the cache directory

Run flutter clean in the project root directory.

Answer 2

1. Delete the pub cache folder from C:\Users\{your username}\AppData\Roaming\Pub.

2. Delete all the packages folders in your project (also in subfolders).

3. Delete the pubspec.lock file in your project.

4. Run pub get again from a command line or select Tools in the Dart Editor menu, and then select Pub Get.

   reference