Cannot install with flutter pub get

[j-vasil]

Added in_call_app_alert: ^0.0.4 to my pubspec.yaml file.

Install failed with the following output:

flutter pub get
Running "flutter pub get" in default_app...                     
Because default_app depends on in_call_app_alert any which doesn't exist (could not find package in_call_app_alert at https://pub.dartlang.org), version solving failed.

pub get failed (server unavailable) -- attempting retry 1 in 1 second...

Because default_app depends on in_call_app_alert any which doesn't exist (could not find package in_call_app_alert at https://pub.dartlang.org), version solving failed.

pub get failed (server unavailable) -- attempting retry 2 in 2 seconds...

It retried 14 times.