Password masking problem

HI I followed the instruction here https://community.jboss.org/wiki/JBossAS7SecuringPasswords
to enable password masking feature in AS7.

However with the datasource configured as described in said document, application server doesn't start and
report a following error:

15:03:16,964 ERROR [org.jboss.as.controller.management-operation] (ServerService Thread Pool – 28) JBAS014612: Operation ("enable") failed - address: ([
("subsystem" => "datasources"),
("data-source" => "ExampleDS")
]): java.lang.SecurityException: JBAS013311: Security Exception
at org.jboss.as.security.vault.RuntimeVaultReader.retrieveFromVault(RuntimeVaultReader.java:104) [jboss-as-security-7.1.0.Final-SNAPSHOT.jar:7.1.0.Final-SNAPSHOT]
at org.jboss.as.server.RuntimeExpressionResolver.resolvePluggableExpression(RuntimeExpressionResolver.java:45) [jboss-as-server-7.1.0.Final-SNAPSHOT.jar:7.1.0.Final-SNAPSHOT]
at org.jboss.as.controller.ExpressionResolverImpl.resolveExpressionsRecursively(ExpressionResolverImpl.java:58) [jboss-as-controller-7.1.0.Final-SNAPSHOT.jar:7.1.0.Final-SNAPSHOT]
at org.jboss.as.controller.ExpressionResolverImpl.resolveExpressions(ExpressionResolverImpl.java:40) [jboss-as-controller-7.1.0.Final-SNAPSHOT.jar:7.1.0.Final-SNAPSHOT]
at org.jboss.as.controller.ModelControllerImpl.resolveExpressions(ModelControllerImpl.java:443) [jboss-as-controller-7.1.0.Final-SNAPSHOT.jar:7.1.0.Final-SNAPSHOT]
at org.jboss.as.controller.OperationContextImpl.resolveExpressions(OperationContextImpl.java:649) [jboss-as-controller-7.1.0.Final-SNAPSHOT.jar:7.1.0.Final-SNAPSHOT]
at org.jboss.as.controller.ParallelBootOperationContext.resolveExpressions(ParallelBootOperationContext.java:263) [jboss-as-controller-7.1.0.Final-SNAPSHOT.jar:7.1.0.Final-SNAPSHOT]
at org.jboss.as.connector.subsystems.datasources.DataSourceModelNodeUtil.getResolvedStringIfSetOrGetDefault(DataSourceModelNodeUtil.java:335) [jboss-as-connector-7.1.0.Final-SNAPSHOT.jar:7.1.0.Final-SNAPSHOT]
at org.jboss.as.connector.subsystems.datasources.DataSourceModelNodeUtil.from(DataSourceModelNodeUtil.java:150) [jboss-as-connector-7.1.0.Final-SNAPSHOT.jar:7.1.0.Final-SNAPSHOT]
at org.jboss.as.connector.subsystems.datasources.DataSourceEnable$1.execute(DataSourceEnable.java:135) [jboss-as-connector-7.1.0.Final-SNAPSHOT.jar:7.1.0.Final-SNAPSHOT]
at org.jboss.as.controller.AbstractOperationContext.executeStep(AbstractOperationContext.java:378) [jboss-as-controller-7.1.0.Final-SNAPSHOT.jar:7.1.0.Final-SNAPSHOT]
at org.jboss.as.controller.AbstractOperationContext.doCompleteStep(AbstractOperationContext.java:265) [jboss-as-controller-7.1.0.Final-SNAPSHOT.jar:7.1.0.Final-SNAPSHOT]
at org.jboss.as.controller.AbstractOperationContext.completeStep(AbstractOperationContext.java:193) [jboss-as-controller-7.1.0.Final-SNAPSHOT.jar:7.1.0.Final-SNAPSHOT]
at org.jboss.as.connector.subsystems.datasources.DataSourceEnable$2.execute(DataSourceEnable.java:236) [jboss-as-connector-7.1.0.Final-SNAPSHOT.jar:7.1.0.Final-SNAPSHOT]
at org.jboss.as.controller.AbstractOperationContext.executeStep(AbstractOperationContext.java:378) [jboss-as-controller-7.1.0.Final-SNAPSHOT.jar:7.1.0.Final-SNAPSHOT]
at org.jboss.as.controller.AbstractOperationContext.doCompleteStep(AbstractOperationContext.java:265) [jboss-as-controller-7.1.0.Final-SNAPSHOT.jar:7.1.0.Final-SNAPSHOT]
at org.jboss.as.controller.AbstractOperationContext.completeStep(AbstractOperationContext.java:193) [jboss-as-controller-7.1.0.Final-SNAPSHOT.jar:7.1.0.Final-SNAPSHOT]
at org.jboss.as.connector.subsystems.datasources.DataSourceEnable$1.execute(DataSourceEnable.java:169) [jboss-as-connector-7.1.0.Final-SNAPSHOT.jar:7.1.0.Final-SNAPSHOT]
at org.jboss.as.controller.AbstractOperationContext.executeStep(AbstractOperationContext.java:378) [jboss-as-controller-7.1.0.Final-SNAPSHOT.jar:7.1.0.Final-SNAPSHOT]
at org.jboss.as.controller.AbstractOperationContext.doCompleteStep(AbstractOperationContext.java:265) [jboss-as-controller-7.1.0.Final-SNAPSHOT.jar:7.1.0.Final-SNAPSHOT]
at org.jboss.as.controller.AbstractOperationContext.completeStep(AbstractOperationContext.java:193) [jboss-as-controller-7.1.0.Final-SNAPSHOT.jar:7.1.0.Final-SNAPSHOT]
at org.jboss.as.controller.ParallelBootOperationStepHandler$ParallelBootTask.run(ParallelBootOperationStepHandler.java:311) [jboss-as-controller-7.1.0.Final-SNAPSHOT.jar:7.1.0.Final-SNAPSHOT]
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) [:1.6.0_24]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) [:1.6.0_24]
at java.lang.Thread.run(Thread.java:662) [:1.6.0_24]
at org.jboss.threads.JBossThread.run(JBossThread.java:122) [jboss-threads-2.0.0.GA.jar:2.0.0.GA]
Caused by: org.jboss.security.vault.SecurityVaultException: PB00027: Vault Mismatch:Shared Key does not match for vault block:ds_MaskedDS and attributeName:password
at org.picketbox.plugins.vault.PicketBoxSecurityVault.retrieve(PicketBoxSecurityVault.java:352) [picketbox-4.0.6.final.jar:4.0.6.final]
at org.jboss.as.security.vault.RuntimeVaultReader.getValue(RuntimeVaultReader.java:124) [jboss-as-security-7.1.0.Final-SNAPSHOT.jar:7.1.0.Final-SNAPSHOT]
at org.jboss.as.security.vault.RuntimeVaultReader.getValueAsString(RuntimeVaultReader.java:112) [jboss-as-security-7.1.0.Final-SNAPSHOT.jar:7.1.0.Final-SNAPSHOT]
at org.jboss.as.security.vault.RuntimeVaultReader.retrieveFromVault(RuntimeVaultReader.java:102) [jboss-as-security-7.1.0.Final-SNAPSHOT.jar:7.1.0.Final-SNAPSHOT]
... 25 more