我正在尝试WSO2AM的升级过程，因此我在一台全新的机器上部署了1.10.0版本，创建并发布了一个简单的API(一种POST方法)，然后遵循这里描述的升级说明。
然而，当按照给定的顺序启动2.1.0(在链接中，"将API管理器升级到2.1.0"，步骤4b)时，每次我都会得到以下错误：
[2017-04-02 16:53:33,051] ERROR - ClassMediatorFactory Error loading class : org.wso2.carbon.apimgt.usage.publisher.APIMgtResponseHandler - Class not found
java.lang.ClassNotFoundException: org.wso2.carbon.apimgt.usage.publisher.APIMgtResponseHandler cannot be found by synapse-core_2.1.7.wso2v10
<long stack trace here, let me know if it's of any value>
[2017-04-02 16:53:33,056] ERROR - ApiDeployer API deployment from the file : /home/gabel/wso2am-2.1.0/repository/deployment/server/synapse-configs/default/api/admin--VPP_REST_v1.0.xml : Failed.
org.apache.synapse.SynapseException: Error loading class : org.wso2.carbon.apimgt.usage.publisher.APIMgtResponseHandler - Class not found
<long stack trace here, let me know if it's of any value>
[2017-04-02 16:53:33,062] ERROR - AbstractSynapseArtifactDeployer Deployment of the Synapse Artifact from file : /home/gabel/wso2am-2.1.0/repository/deployment/server/synapse-configs/default/api/admin--VPP_REST_v1.0.xml : Failed!
org.apache.synapse.deployers.SynapseArtifactDeploymentException: API deployment from the file : /home/gabel/wso2am-2.1.0/repository/deployment/server/synapse-configs/default/api/admin--VPP_REST_v1.0.xml : Failed.
<long stack trace here, let me know if it's of any value>
[2017-04-02 16:53:33,067] INFO - AbstractSynapseArtifactDeployer The file has been backed up into : NO_BACKUP_ON_WORKER.INFO
[2017-04-02 16:53:33,067] ERROR - AbstractSynapseArtifactDeployer Deployment of synapse artifact failed. Error reading /home/gabel/wso2am-2.1.0/repository/deployment/server/synapse-configs/default/api/admin--VPP_REST_v1.0.xml : API deployment from the file : /home/gabel/wso2am-2.1.0/repository/deployment/server/synapse-configs/default/api/admin--VPP_REST_v1.0.xml : Failed.
org.apache.axis2.deployment.DeploymentException: API deployment from the file : /home/gabel/wso2am-2.1.0/repository/deployment/server/synapse-configs/default/api/admin--VPP_REST_v1.0.xml : Failed.
<long stack trace here, let me know if it's of any value>
Caused by: org.apache.synapse.deployers.SynapseArtifactDeploymentException: API deployment from the file : /home/gabel/wso2am-2.1.0/repository/deployment/server/synapse-configs/default/api/admin--VPP_REST_v1.0.xml : Failed.
<long stack trace here, let me know if it's of any value>
[2017-04-02 16:53:33,083] INFO - DeploymentEngine org.apache.axis2.deployment.DeploymentException: API deployment from the file : /home/gabel/wso2am-2.1.0/repository/deployment/server/synapse-configs/default/api/admin--VPP_REST_v1.0.xml : Failed.
当然，当我按照给定的顺序执行完所有命令并转到发布服务器时，名为VPP_REST的API就不存在了。我错过了什么？
系统：
- 操作系统：Ubuntu服务器14.04 64位
- JDK:1.8.0_121
运行步骤5中给出的apim200_to_apim210_gateway_artifact_migrator.sh脚本，然后执行步骤4b。(因此，它将执行类名迁移，这需要在DB迁移之前在突触中进行)