Validate Your AppSpec File
You can use a YAML validator to validate your AppSpec file.
To verify that you have placed your AppSpec file in the root directory of the application's source content's directory structure, run one of the following commands:
For Linux, macOS, or Unix:
If the AppSpec file is not located there, there will be no output.
If the AppSpec file is not located there, a "File Not Found" error will be displayed.