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Command cannot be empty
java.lang.IllegalArgumentException: groupName cannot be null or empty	at org.apache.commons.lang.Validate.notEmpty(Validate.java:363)	at com.atlassian.crowd.integration.directory.internal.InternalDirectory.isUserDirectGroupMember(InternalDirectory.java:673)	at com.atlassian.crowd.manager.directory.DirectoryManagerGeneric.isUserDirectGroupMember(DirectoryManagerGeneric.java:535)	at com.atlassian.crowd.manager.directory.DirectoryManagerGeneric.addUserToGroup(DirectoryManagerGeneric.java:559)