The type League\Event\AbstractEvent was not found. Maybe you did not declare it correctly or list all dependencies?
The issue could also be caused by a filter entry in the build configuration.
If the path has been excluded in your configuration, e.g. excluded_paths:["lib/*"],
you can move it to the dependency path list as follows:
The method getId() does not exist on hiqdev\php\billing\price\PriceInterface. Since it exists in all sub-types, consider adding an abstract or default implementation to hiqdev\php\billing\price\PriceInterface.
Ignorable by Annotation
If this is a false-positive, you can also ignore this issue in your code via the ignore-call annotation