AUR0004

Resolver for yyyy returned a null factory

Error message

Resolver for yyyy returned a null factory

Parameters

String version of the key being resolved

Error explanation

This error occurs when the DI container tries to resolve a transient registration, but no factory was found for the given key. A factory is required to create new instances for transients, and if it is missing or not properly registered, this error will be thrown.

Common causes

• You registered a transient dependency without providing a factory.

• The factory for the key was not registered correctly or was accidentally removed.

• There is a typo or mismatch in the key used for registration and resolution.

• A plugin or library expected to register the factory did not do so.

How to fix

• Register a factory for the key using container.registerFactory(IMyInterface, someFactoryObject).

• Double-check that the key used for registration matches the key used for resolution.

• Ensure that any plugins or libraries you are using are properly configured and registered.

Debugging tips

• Check the stack trace to see where the resolution was attempted.

• Search your codebase for all registrations and resolutions of the key in question.

• If using plugins, try disabling them one at a time to isolate the source.