java.lang.UnsupportedOperationException: null

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java.lang.UnsupportedOperationException: null
at java.util.AbstractCollection.add(AbstractCollection.java:262)
at org.dcm4chee.arc.conf.json.JsonArchiveConfiguration.loadIDGenerators(JsonArchiveConfiguration.java:1014)
at org.dcm4chee.arc.conf.json.JsonArchiveConfiguration.loadFrom(JsonArchiveConfiguration.java:587)
at org.dcm4chee.arc.conf.json.JsonArchiveConfiguration.loadDeviceExtension(JsonArchiveConfiguration.java:382)
at org.dcm4che3.conf.json.JsonConfiguration.loadDeviceExtension(JsonConfiguration.java:308)
at org.dcm4che3.conf.json.JsonConfiguration.loadDeviceFrom(JsonConfiguration.java:294)
at org.dcm4chee.arc.conf.ArchiveDeviceJsonConfigurationTest.testJsonPersist(ArchiveDeviceJsonConfigurationTest.java:93)

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