Hello when i try migrate jboss 7.4 to 8 i give the error

RROR Migration failed: org.jboss.migration.core.ServerMigrationFailureException: java.lang.UnsupportedOperationException: The source configuration includes Vault, which migration is unsupported by the tool and needs to be done manually in advance. If you want to proceed with the migration please restart migration with environment property security.migrate-vault.fail-if-vault-found set as false.
        at org.jboss.migration.core.task.TaskExecutionImpl.run(TaskExecutionImpl.java:174)
        at org.jboss.migration.core.task.TaskExecutionImpl.execute(TaskExecutionImpl.java:159)
        at org.jboss.migration.core.task.TaskContextImpl.execute(TaskContextImpl.java:68)
        at org.jboss.migration.core.task.TaskContextImpl.execute(TaskContextImpl.java:32)
        at org.jboss.migration.wfly10.config.task.ServerConfigurationMigration$1.run(ServerConfigurationMigration.java:88)
        at org.jboss.migration.core.task.TaskExecutionImpl.run(TaskExecutionImpl.java:169)
        at org.jboss.migration.core.task.TaskExecutionImpl.execute(TaskExecutionImpl.java:159)
        at org.jboss.migration.core.task.TaskContextImpl.execute(TaskContextImpl.java:68)
        at org.jboss.migration.core.task.TaskContextImpl.execute(TaskContextImpl.java:32)
        at org.jboss.migration.wfly10.config.task.ServerConfigurationsMigration$Task.migrateConfig(ServerConfigurationsMigration.java:151)
        at org.jboss.migration.wfly10.config.task.ServerConfigurationsMigration$Task.migrateAllConfigs(ServerConfigurationsMigration.java:120)
        at org.jboss.migration.wfly10.config.task.ServerConfigurationsMigration$Task.run(ServerConfigurationsMigration.java:105)
        at org.jboss.migration.core.task.TaskExecutionImpl.run(TaskExecutionImpl.java:169)
        at org.jboss.migration.core.task.TaskExecutionImpl.execute(TaskExecutionImpl.java:159)
        at org.jboss.migration.core.task.TaskContextImpl.execute(TaskContextImpl.java:68)
        at org.jboss.migration.core.task.TaskContextImpl.execute(TaskContextImpl.java:32)
        at org.jboss.migration.wfly10.config.task.StandaloneServerMigration$1.run(StandaloneServerMigration.java:61)
        at org.jboss.migration.core.console.UserConfirmationServerMigrationTask.runTask(UserConfirmationServerMigrationTask.java:58)
        at org.jboss.migration.core.console.UserConfirmationServerMigrationTask.confirmTaskRun(UserConfirmationServerMigrationTask.java:50)
        at org.jboss.migration.core.console.UserConfirmationServerMigrationTask.run(UserConfirmationServerMigrationTask.java:63)
        at org.jboss.migration.core.env.SkippableByEnvServerMigrationTask.run(SkippableByEnvServerMigrationTask.java:47)
        at org.jboss.migration.core.task.TaskExecutionImpl.run(TaskExecutionImpl.java:169)
        at org.jboss.migration.core.task.TaskExecutionImpl.execute(TaskExecutionImpl.java:159)
        at org.jboss.migration.core.task.TaskContextImpl.execute(TaskContextImpl.java:68)
        at org.jboss.migration.core.task.TaskContextImpl.execute(TaskContextImpl.java:32)
        at org.jboss.migration.wfly10.config.task.ServerMigration.run(ServerMigration.java:45)
        at org.jboss.migration.wfly10.WildFlyServer10.migrate(WildFlyServer10.java:40)
        at org.jboss.migration.core.ServerMigration$1.run(ServerMigration.java:153)
        at org.jboss.migration.core.task.TaskExecutionImpl.run(TaskExecutionImpl.java:169)
        at org.jboss.migration.core.ServerMigration.run(ServerMigration.java:160)
        at org.jboss.migration.cli.CommandLineServerMigration.main(CommandLineServerMigration.java:131)
Caused by: java.lang.UnsupportedOperationException: The source configuration includes Vault, which migration is unsupported by the tool and needs to be done manually in advance. If you want to proceed with the migration please restart migration with environment property security.migrate-vault.fail-if-vault-found set as false.
        at org.jboss.migration.wfly.task.xml.WildFly26_0MigrateVault.lambda$processXMLConfiguration$1(WildFly26_0MigrateVault.java:66)
        at org.jboss.migration.core.util.xml.XMLFiles.filter(XMLFiles.java:140)
        at org.jboss.migration.core.util.xml.XMLFiles.filter(XMLFiles.java:119)
        at org.jboss.migration.wfly.task.xml.WildFly26_0MigrateVault.processXMLConfiguration(WildFly26_0MigrateVault.java:75)
        at org.jboss.migration.wfly.task.xml.WildFly26_0MigrateVault.lambda$getTask$0(WildFly26_0MigrateVault.java:48)
        at org.jboss.migration.core.task.component.SimpleComponentTask$BaseBuilder.lambda$buildRunnable$0(SimpleComponentTask.java:119)
        at org.jboss.migration.core.task.component.SimpleComponentTask.run(SimpleComponentTask.java:46)
        at org.jboss.migration.core.task.TaskExecutionImpl.run(TaskExecutionImpl.java:169)
        ... 30 more