AUR0023

Resource key '{{0}}' has already been registered.

Error message

Resource key '{{0}}' has already been registered.

Parameters

Resource key (string)

Error explanation

This error occurs when you attempt to register a resource (such as a custom element, attribute, value converter, or binding behavior) with a key that has already been registered in the container. Resource keys must be unique within a container.

Common causes

• Attempting to register the same resource more than once.

• Using the same name for multiple resources of the same type.

• A plugin or library is registering a resource with a name that conflicts with one in your application.

How to fix

• Use unique names for your resources (elements, attributes, value converters, binding behaviors, etc.).

• Check for duplicate registrations in your code and in any plugins you are using.

• If a plugin is causing the conflict, consult its documentation or consider renaming your resource.

Debugging tips

• Check the stack trace to see where the duplicate registration is occurring.

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

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