NullInjectorError: No provider for FaConfig

This is an issue in the latest version 0.6.0-alpha.0, which may get installed automatically when you don't specify the version.

https://github.com/FortAwesome/angular-fontawesome/issues/210

You can downgrade to version 0.5.0 to resolve this AOT build error:

npm i @fortawesome/[email protected]