Following REST tutorial results in error

[tksrmz]

Describe the content issue: Running the application after following the tutorial results in an error.

[ERROR:flutter/runtime/dart_vm_initializer.cc(41)] Unhandled Exception: ConfigurationError {
  "message": "No Cognito plugin config available"
}

amplify-cli version: 12.7.1

URL page where content issue is:

https://docs.amplify.aws/lib/restapi/getting-started/q/platform/flutter/