我正在从camle 2迁移到camle 3，配置如下

<onException>
    <exception>com.sample</exception>
    <redeliveryPolicy disableRedelivery="true"/>
    <handled>
      <constant>true</constant>
    </handled>
    <log message="got here, before predict, ${exchangeProperty.firstCall}" loggingLevel="INFO"/>
    <choice>
      <when>
        <method>operation</method>
        <bean ref="Procs" method="SampleCommentRequestForError"/>
        <setProperty propertyName="firstCall">
          <constant>false</constant>
        </setProperty>
        <log message="got here, after predict, ${exchangeProperty.firstCallOf}" loggingLevel="INFO"/>
        <to uri="direct:sample-comment"/>
      </when>
    </choice>
    <bean ref="abc_errorhandler" method="abcException"/>
  </onException>

并获取以下异常：无法在以下位置创建路由route-nsm-client-call：〉〉〉OnException[[com.sample] -〉[Log[在预测之前到达此处，${exchangeProperty.firstCall]，选择[[When[bean{abc} [From[direct：bbc-call -〉...因为Bean语言需要bean、beanType或ref参数

Caused by: java.lang.IllegalArgumentException: Bean language requires bean, beanType, or ref argument

有什么想法吗？