由于“无效标记”错误，无法构造java对象

我构建了一个Web应用程序，通过Redisson驱动程序与Redis缓存集群通信 . Redisson驱动程序从YAML文件加载其配置 . 该配置包含使用用于创建对象的构造函数创建的一些属性 . 由于某些原因，由于这些构造函数方法调用导致配置无法加载，并出现以下错误：

org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/SessionManagement]]
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:153)
    at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:725)
    at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:701)
    at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:717)
    at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:939)
    at org.apache.catalina.startup.HostConfig$DeployWar.run(HostConfig.java:1812)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:745)
Caused by: Can't construct a java object for org.redisson.connection.balancer.RoundRobinLoadBalancer; exception=Invalid tag: org.redisson.connection.balancer.RoundRobinLoadBalancer
 in 'reader', line 14, column 17:
      loadBalancer: !<org.redisson.connection.balanc ... 
                    ^

    at org.yaml.snakeyaml.constructor.Constructor$ConstructYamlObject.construct(Constructor.java:350)
    at org.yaml.snakeyaml.constructor.BaseConstructor.constructObject(BaseConstructor.java:182)
    at org.yaml.snakeyaml.constructor.BaseConstructor.constructMapping2ndStep(BaseConstructor.java:373)

这是YAML文件：

---
clusterServersConfig:
  idleConnectionTimeout: 10000
  pingTimeout: 1000
  connectTimeout: 1000
  timeout: 1000
  retryAttempts: 3
  retryInterval: 1000
  reconnectionTimeout: 3000
  failedAttempts: 3
  password: null
  subscriptionsPerConnection: 5
  clientName: null
  loadBalancer: !<org.redisson.connection.balancer.RoundRobinLoadBalancer> {}
  slaveSubscriptionConnectionMinimumIdleSize: 1
  slaveSubscriptionConnectionPoolSize: 25
  slaveConnectionMinimumIdleSize: 5
  slaveConnectionPoolSize: 100
  masterConnectionMinimumIdleSize: 5
  masterConnectionPoolSize: 100
  readMode: "SLAVE"
  nodeAddresses:
  - "//172.31.150.113:7000"
  - "//172.31.150.113:7001"
  - "//172.31.150.113:7002"
  - "//172.31.150.113:7003"
  - "//172.31.150.113:7004"
  - "//172.31.150.113:7005"
  scanInterval: 1000
threads: 0
codec: !<org.redisson.codec.JsonJacksonCodec> {}
useLinuxNativeEpoll: false
eventLoopGroup: null

我验证了对象创建所需的redisson库是在类路径上 .
有没有人知道为什么这个YAML文件无法被Snakeyaml正确加载？