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There could be several reasons for encountering an error during marshaling when using Keycloak along with an external Infinispan and Console. Some possible reasons are:

1. Incompatibility between Keycloak and Infinispan versions: Keycloak may be using a version of Infinispan that is not compatible with the external Infinispan instance. This can cause issues with marshaling and unmarshaling of data.

2. Configuration issues: The configuration of Keycloak and the external Infinispan instance may not be set up correctly. For example, the serialization method used by Keycloak may not be compatible with the serialization method used by the external Infinispan instance.

3. Classpath issues: The necessary classes and dependencies required for marshaling and unmarshaling may not be on the classpath. This can cause issues with serialization and deserialization.

To resolve these issues, it is important to ensure that the versions of Keycloak and Infinispan are compatible, that the configuration is set up correctly, and that the necessary classes and dependencies are on the classpath. Additionally, it may be helpful to consult the logs and error messages for more information on the specific error encountered.