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java.lang.NullPointerException: 	at com.atlassian.jira.scheme.mapper.SchemeTransformResult.addRoleMappingForGroup(SchemeTransformResult.java:126)	at com.atlassian.jira.scheme.mapper.SchemeGroupsToRolesTransformerImpl.transformScheme(SchemeGroupsToRolesTransformerImpl.java:172)	at com.atlassian.jira.scheme.mapper.SchemeGroupsToRolesTransformerImpl.doTransform(SchemeGroupsToRolesTransformerImpl.java:48)	at com.atlassian.jira.bc.scheme.mapper.DefaultSchemeGroupsToRoleTransformerService.doTransform(DefaultSchemeGroupsToRoleTransformerService.java:41)	at com.atlassian.jira.web.action.admin.scheme.mapper.SchemeGroupToRoleTransformerAction.doDefault(SchemeGroupToRoleTransformerAction.java:50)