Getting an IO exception from the postgres driver when upgrading JAC data from the ResolutionDate upgrade task

2009-08-04 11:40:20,696 main ERROR     [atlassian.jira.upgrade.UpgradeManagerImpl] Exception thrown during upgrade: org.ofbiz.core.entity.GenericDataSourceException
: Generic Entity Exception occurred in deleteAll (SQL Exception while executing the following:DELETE FROM public.customfieldvalue WHERE ID=? (An I/O error occured w
hile sending to the backend.))
com.atlassian.jira.exception.DataAccessException: org.ofbiz.core.entity.GenericDataSourceException: Generic Entity Exception occurred in deleteAll (SQL Exception wh
ile executing the following:DELETE FROM public.customfieldvalue WHERE ID=? (An I/O error occured while sending to the backend.))
        at com.atlassian.jira.ofbiz.DefaultOfBizDelegator.removeAll(DefaultOfBizDelegator.java:154)
        at com.atlassian.jira.issue.customfields.persistence.OfBizCustomFieldValuePersister.removeAllValues(OfBizCustomFieldValuePersister.java:200)
        at com.atlassian.jira.issue.customfields.persistence.EagerLoadingOfBizCustomFieldPersister.removeAllValues(EagerLoadingOfBizCustomFieldPersister.java:71)
        at com.atlassian.jira.issue.managers.DefaultCustomFieldManager.removeCustomFieldPossiblyLeavingOrphanedData(DefaultCustomFieldManager.java:435)
        at com.atlassian.jira.upgrade.tasks.UpgradeTask_Build401.removeCustomFields(UpgradeTask_Build401.java:364)
        at com.atlassian.jira.upgrade.tasks.UpgradeTask_Build401.doUpgrade(UpgradeTask_Build401.java:134)
        at com.atlassian.jira.upgrade.UpgradeManagerImpl.doUpgradeTaskSucess(UpgradeManagerImpl.java:670)
        at com.atlassian.jira.upgrade.UpgradeManagerImpl.runUpgradeTasks(UpgradeManagerImpl.java:567)
        at com.atlassian.jira.upgrade.UpgradeManagerImpl.doUpgrade(UpgradeManagerImpl.java:401)
        at com.atlassian.jira.upgrade.UpgradeManagerImpl.doUpgradeIfNeeded(UpgradeManagerImpl.java:351)
        at com.atlassian.jira.upgrade.UpgradeManagerImpl.doUpgradeIfNeededAndAllowed(UpgradeManagerImpl.java:308)
        at com.atlassian.jira.upgrade.UpgradeLauncher.checkIfUpgradeNeeded(UpgradeLauncher.java:85)
        at com.atlassian.jira.upgrade.UpgradeLauncher.contextInitialized(UpgradeLauncher.java:45)
        at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:3763)        at org.apache.catalina.core.StandardContext.start(StandardContext.java:4211)
        at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1013)
        at org.apache.catalina.core.StandardHost.start(StandardHost.java:718)
        at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1013)
        at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:442)
        at org.apache.catalina.core.StandardService.start(StandardService.java:450)
        at org.apache.catalina.core.StandardServer.start(StandardServer.java:709)
        at org.apache.catalina.startup.Catalina.start(Catalina.java:551)        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)        at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:294)
        at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:432)Caused by: org.ofbiz.core.entity.GenericDataSourceException: Generic Entity Exception occurred in deleteAll (SQL Exception while executing the following:DELETE FROM
 public.customfieldvalue WHERE ID=? (An I/O error occured while sending to the backend.))        at org.ofbiz.core.entity.GenericDAO.deleteAll(GenericDAO.java:1284)
        at org.ofbiz.core.entity.GenericHelperDAO.removeAll(GenericHelperDAO.java:236)
        at org.ofbiz.core.entity.GenericDelegator.removeAll(GenericDelegator.java:1580)
        at org.ofbiz.core.entity.GenericDelegator.removeAll(GenericDelegator.java:1523)
        at com.atlassian.jira.ofbiz.DefaultOfBizDelegator.removeAll(DefaultOfBizDelegator.java:150)