When creating and @ app from a demo template it is expected that the app should just run without any editing of the files created.

[cconstab]

Describe the bug
When creating and @ app from a demo template it is expected that the app should just run without any editing of the files created. However when the app is run it fails with an error in AtEnv.load()

To Reproduce
Steps to reproduce the behavior:

1. create an at_app demo template
2. create the app
   3.then run the app

Expected behavior
A clear and concise description of what you expected to happen.

Screenshots

Smartphone (please complete the following information):

• Device: [e.g. iPhone11]
• OS: [e.g. iOS14.1]
• Browser [e.g. stock browser, safari]
• Version [e.g. 59]

Smartphone (please complete the following information):

• Windows

PS S:\TEMP\test4> flutter --version
Flutter 2.8.1 • channel stable • https://github.com/flutter/flutter.git
Framework • revision 77d935af4d (5 hours ago) • 2021-12-16 08:37:33 -0800
Engine • revision 890a5fca2e
Tools • Dart 2.15.1
PS S:\TEMP\test4>