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java.lang.NullPointerException: 	at liquibase.changelog.StandardChangeLogHistoryService.tag(StandardChangeLogHistoryService.java:304)	at liquibase.database.AbstractJdbcDatabase.tag(AbstractJdbcDatabase.java:834)	at liquibase.Liquibase.tag(Liquibase.java:695)	at liquibase.integration.ant.TagDatabaseTask.executeWithLiquibaseClassloader(TagDatabaseTask.java:32)	at liquibase.integration.ant.BaseLiquibaseTask.execute(BaseLiquibaseTask.java:75)	at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:291)	at sun.reflect.GeneratedMethodAccessor4.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:606)	at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)	at org.apache.tools.ant.Task.perform(Task.java:348)	at org.apache.tools.ant.Target.execute(Target.java:390)	at org.apache.tools.ant.Target.performTasks(Target.java:411)	at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1399)	at org.apache.tools.ant.Project.executeTarget(Project.java:1368)	at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:41)	at org.apache.tools.ant.Project.executeTargets(Project.java:1251)	at org.apache.tools.ant.Main.runBuild(Main.java:809)	at org.apache.tools.ant.Main.startAnt(Main.java:217)	at org.apache.tools.ant.launch.Launcher.run(Launcher.java:280)	at org.apache.tools.ant.launch.Launcher.main(Launcher.java:109)