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    java.lang.ClassCastException: java.util.HashSet cannot be cast to java.util.List
        at com.atlassian.confluence.upgrade.upgradetask.OnDemandSpacePermissionsDefaultUpgradeTask.getOldDefaults(OnDemandSpacePermissionsDefaultUpgradeTask.java:93)
        at com.atlassian.confluence.upgrade.upgradetask.OnDemandSpacePermissionsDefaultUpgradeTask.doUpgrade(OnDemandSpacePermissionsDefaultUpgradeTask.java:48)
        at com.atlassian.confluence.upgrade.AbstractUpgradeManager$UpgradeStep$4.execute(AbstractUpgradeManager.java:531)
        at com.atlassian.confluence.upgrade.AbstractUpgradeManager.executeUpgradeStep(AbstractUpgradeManager.java:227)