ch.qos.cal10n.MessageConveyorException: Failed to locate resource bundle [Bundle] for locale [en_US] for enum type [com.mycompany.Messages]

at ch.qos.cal10n.MessageConveyor.lookup(MessageConveyor.java:115)

at ch.qos.cal10n.MessageConveyor.getMessage(MessageConveyor.java:77)

at org.slf4j.cal10n.LocLogger.error(LocLogger.java:167)

I have a default Bundle.properties in my classpath but cal10n doesn't use it.

Everything works fine when I have a Bundle_en_US.properties.

Is there a way to tell cal10n to use the default Bundle.properties if a suitable bundle for the Locale it requires is missing?