NG0209: Expected provider to be `multi: true` but did not get an Array
Description
The Angular runtime will throw this error when it injects a token intended to be used with multi: true but a non-Array was found instead. For example, ENVIRONMENT_INITIALIZER should be provided like {provide: ENVIRONMENT_INITIALIZER, multi: true, useValue: () => {...}}.
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https://v16.angular.io/errors/NG0209