What does the error message "com.google.cloud.firestore.FirestoreException: io.grpc.ManagedChannelProvider$ProviderNotFoundException: No functional channel service provider found" indicate?

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The error message indicates that the Firestore library cannot find a provider for the managed channel service used to establish a connection to the Firestore backend. This could be due to a missing dependency or an incorrect configuration, which prevents the library from creating a functional channel to communicate with Firestore.