我正在尝试将Liferay 6.0.5升级到6.1.0。为此，我按照网站https://www.liferay.com/documentation/liferay-portal/6.1/user-guide/-/ai/upgrading-lifer-5中的步骤操作。但在升级过程中，我收到了以下错误。
10:48:21,489 INFO [DialectDetector:80] Determine dialect for PostgreSQL 9
10:48:21,522 INFO [DialectDetector:145] Found dialect org.hibernate.dialect.PostgreSQLDialect
Starting Liferay Portal Community Edition 6.1.0 CE (Paton / Build 6100 / January 6, 2012)
10:48:44,349 INFO [BaseDB:406] Database supports case sensitive queries
10:48:44,530 INFO [UpgradeProcess:205] Upgrading com.liferay.portal.upgrade.UpgradeProcess_6_0_6
10:48:44,532 INFO [UpgradeProcess:205] Upgrading com.liferay.portal.upgrade.v6_0_6.UpgradeSchema
10:48:44,599 INFO [UpgradeProcess:205] Upgrading com.liferay.portal.upgrade.v6_0_6.UpgradeRSS
10:48:45,006 INFO [UpgradeProcess:205] Upgrading com.liferay.portal.upgrade.UpgradeProcess_6_1_0
10:48:45,007 INFO [UpgradeProcess:205] Upgrading com.liferay.portal.upgrade.v6_1_0.UpgradeSchema
10:49:07,783 INFO [UpgradeProcess:205] Upgrading com.liferay.portal.upgrade.v6_1_0.UpgradeUserName
10:49:08,272 INFO [UpgradeProcess:205] Upgrading com.liferay.portal.upgrade.v6_1_0.UpgradeAdminPortlets
10:49:21,512 INFO [UpgradeProcess:205] Upgrading com.liferay.portal.upgrade.v6_1_0.UpgradeBlogs
10:49:21,529 INFO [UpgradeProcess:205] Upgrading com.liferay.portal.upgrade.v6_1_0.UpgradeCamelCasePortletPreferences
10:53:16,032 INFO [UpgradeProcess:205] Upgrading com.liferay.portal.upgrade.v6_1_0.UpgradeCountry
10:53:16,264 INFO [UpgradeProcess:205] Upgrading com.liferay.portal.upgrade.v6_1_0.UpgradeDocumentLibrary
11:00:46,866 INFO [UpgradeProcess:205] Upgrading com.liferay.portal.upgrade.v6_1_0.UpgradeExpando
11:00:46,872 INFO [UpgradeProcess:205] Upgrading com.liferay.portal.upgrade.v6_1_0.UpgradeGroup
11:00:51,024 ERROR [MainServlet:198] com.liferay.portal.kernel.events.ActionException: com.liferay.portal.kernel.upgrade.UpgradeException: com.liferay.portal.kernel.upgrade.UpgradeException: org.postgresql.util.PSQLException: ERROR: syntax error at or near "s"
Position: 81
com.liferay.portal.kernel.events.ActionException: com.liferay.portal.kernel.upgrade.UpgradeException: com.liferay.portal.kernel.upgrade.UpgradeException: org.postgresql.util.PSQLException: ERROR: syntax error at or near "s"
Position: 81
at com.liferay.portal.events.StartupAction.run(StartupAction.java:58)
at com.liferay.portal.servlet.MainServlet.processStartupEvents(MainServlet.java:1267)
at com.liferay.portal.servlet.MainServlet.init(MainServlet.java:195)
at javax.servlet.GenericServlet.init(GenericServlet.java:160)
at org.apache.catalina.core.StandardWrapper.initServlet(StandardWrapper.java:1266)
at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1185)
at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:1080)
at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:5001)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5289)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:866)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:842)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:615)
at org.apache.catalina.startup.HostConfig.deployDescriptor(HostConfig.java:649)
at org.apache.catalina.startup.HostConfig$DeployDescriptor.run(HostConfig.java:1581)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
at java.util.concurrent.FutureTask.run(FutureTask.java:166)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1146)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:679)
Caused by: com.liferay.portal.kernel.upgrade.UpgradeException: com.liferay.portal.kernel.upgrade.UpgradeException: org.postgresql.util.PSQLException: ERROR: syntax error at or near "s"
Position: 81
at com.liferay.portal.kernel.upgrade.UpgradeProcess.upgrade(UpgradeProcess.java:211)
at com.liferay.portal.upgrade.UpgradeProcessUtil._upgradeProcess(UpgradeProcessUtil.java:93)
at com.liferay.portal.upgrade.UpgradeProcessUtil.upgradeProcess(UpgradeProcessUtil.java:46)
at com.liferay.portal.events.StartupHelper.upgradeProcess(StartupHelper.java:81)
at com.liferay.portal.events.StartupHelperUtil.upgradeProcess(StartupHelperUtil.java:40)
at com.liferay.portal.tools.DBUpgrader.upgrade(DBUpgrader.java:119)
at com.liferay.portal.events.StartupAction.doRun(StartupAction.java:144)
at com.liferay.portal.events.StartupAction.run(StartupAction.java:52)
... 20 more
Caused by: com.liferay.portal.kernel.upgrade.UpgradeException: org.postgresql.util.PSQLException: ERROR: syntax error at or near "s"
Position: 81
at com.liferay.portal.kernel.upgrade.UpgradeProcess.upgrade(UpgradeProcess.java:211)
at com.liferay.portal.kernel.upgrade.UpgradeProcess.upgrade(UpgradeProcess.java:225)
at com.liferay.portal.upgrade.UpgradeProcess_6_1_0.doUpgrade(UpgradeProcess_6_1_0.java:66)
at com.liferay.portal.kernel.upgrade.UpgradeProcess.upgrade(UpgradeProcess.java:208)
... 27 more
Caused by: org.postgresql.util.PSQLException: ERROR: syntax error at or near "s"
Position: 81
at org.postgresql.core.v3.QueryExecutorImpl.receiveErrorResponse(QueryExecutorImpl.java:2103)
at org.postgresql.core.v3.QueryExecutorImpl.processResults(QueryExecutorImpl.java:1836)
at org.postgresql.core.v3.QueryExecutorImpl.execute(QueryExecutorImpl.java:257)
at org.postgresql.jdbc2.AbstractJdbc2Statement.execute(AbstractJdbc2Statement.java:512)
at org.postgresql.jdbc2.AbstractJdbc2Statement.executeWithFlags(AbstractJdbc2Statement.java:374)
at org.postgresql.jdbc2.AbstractJdbc2Statement.executeUpdate(AbstractJdbc2Statement.java:302)
at com.mchange.v2.c3p0.impl.NewProxyStatement.executeUpdate(NewProxyStatement.java:64)
at com.liferay.portal.dao.db.BaseDB.runSQL(BaseDB.java:237)
at com.liferay.portal.dao.db.BaseDB.runSQL(BaseDB.java:204)
at com.liferay.portal.dao.db.BaseDB.runSQL(BaseDB.java:191)
at com.liferay.portal.kernel.upgrade.UpgradeProcess.runSQL(UpgradeProcess.java:115)
at com.liferay.portal.upgrade.v6_1_0.UpgradeGroup.updateName(UpgradeGroup.java:86)
at com.liferay.portal.upgrade.v6_1_0.UpgradeGroup.doUpgrade(UpgradeGroup.java:51)
at com.liferay.portal.kernel.upgrade.UpgradeProcess.upgrade(UpgradeProcess.java:208)
... 30 more