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Angular’s NG0209 error means the same dependency-injection token has been configured with both a multi provider and a regular provider. Choose whether that token should resolve to one value or an array of contributions, then make every registration for that token consistent.
What Angular NG0209 means
Angular’s Error Encyclopedia names NG0209 “Invalid multi provider.” The runtime message, “Cannot mix multi providers and regular providers,” identifies the configuration conflict: a token has been registered using both provider styles.
With multi: true, multiple providers can contribute values to one token. When injected, that token resolves to an array containing those contributions, as described in Angular’s dependency provider guide and ConstructorProvider API. A regular provider instead represents a single provider value for the token.
How to find the conflicting registrations
- Read the complete error. Note the token identified in the runtime message; the token, rather than the location where the error surfaces, is the starting point for the search.
- Search the relevant injector configuration. Find every provider registration for that token, including registrations brought in by imported configuration. Compare registrations for the same token and provider scope.
- Choose the intended shape. Decide whether injection should return one value or an array assembled from contributions.
- Make the registrations consistent. For an array of contributions, use the multi-provider pattern consistently for that token. For one value, remove multi-provider use for it and configure it as a regular provider.
- Run the application again. If NG0209 remains, continue checking registrations for the same token in other relevant or imported injector configurations.
Choose a single value or multiple contributions
| Intended result | Provider configuration | Injected result |
|---|---|---|
| One value for the token | Use a regular provider and do not use multi: true for that token. |
A single provider value. |
| Values contributed by several registrations | Use the multi-provider pattern consistently: each contributing provider uses multi: true. |
An array of contributed values. |
The important distinction is token identity. A regular provider for one token and a multi provider for a different token are not the conflict described by NG0209; investigate registrations that refer to the same token.
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What NG0209 does not tell you
NG0209 identifies an invalid multi-provider configuration. It is not the missing-provider diagnostic or a wrong-injection-context error. The error label is documented in Angular’s error index; the explanation that mixed provider styles trigger the message is supported by Angular’s runtime message. Runtime details may differ between Angular releases.
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