otsstreamreader找不到相应的类

这个问题该如何解决？
经DataX智能分析,该任务最可能的错误原因是:
com.alibaba.datax.common.exception.DataXException: Code:[Framework-02], Description:[DataX引擎运行过程出错，具体原因请参看DataX运行结束时的错误诊断信息 .]. - java.lang.ClassNotFoundException: com.alibaba.datax.plugin.reader.otsstreamreader.internal.OTSStreamReader$Job
at java.net.URLClassLoader.findClass(URLClassLoader.java:387)
at java.lang.ClassLoader.loadClass(ClassLoader.java:418)
at java.lang.ClassLoader.loadClass(ClassLoader.java:351)
at com.alibaba.datax.core.util.container.LoadUtil.loadPluginClass(LoadUtil.java:173)
at com.alibaba.datax.core.util.container.LoadUtil.loadJobPlugin(LoadUtil.java:93)
at com.alibaba.datax.core.job.JobContainer.initJobReader(JobContainer.java:661)
at com.alibaba.datax.core.job.JobContainer.init(JobContainer.java:303)
at com.alibaba.datax.core.job.JobContainer.start(JobContainer.java:113)
at com.alibaba.datax.core.Engine.start(Engine.java:92)
at com.alibaba.datax.core.Engine.entry(Engine.java:171)
at com.alibaba.datax.core.Engine.main(Engine.java:204)
- java.lang.ClassNotFoundException: com.alibaba.datax.plugin.reader.otsstreamreader.internal.OTSStreamReader$Job
at java.net.URLClassLoader.findClass(URLClassLoader.java:387)
at java.lang.ClassLoader.loadClass(ClassLoader.java:418)
at java.lang.ClassLoader.loadClass(ClassLoader.java:351)
at com.alibaba.datax.core.util.container.LoadUtil.loadPluginClass(LoadUtil.java:173)
at com.alibaba.datax.core.util.container.LoadUtil.loadJobPlugin(LoadUtil.java:93)
at com.alibaba.datax.core.job.JobContainer.initJobReader(JobContainer.java:661)
at com.alibaba.datax.core.job.JobContainer.init(JobContainer.java:303)
at com.alibaba.datax.core.job.JobContainer.start(JobContainer.java:113)
at com.alibaba.datax.core.Engine.start(Engine.java:92)
at com.alibaba.datax.core.Engine.entry(Engine.java:171)
at com.alibaba.datax.core.Engine.main(Engine.java:204)

at com.alibaba.datax.common.exception.DataXException.asDataXException(DataXException.java:40)
at com.alibaba.datax.core.util.container.LoadUtil.loadPluginClass(LoadUtil.java:176)
at com.alibaba.datax.core.util.container.LoadUtil.loadJobPlugin(LoadUtil.java:93)
at com.alibaba.datax.core.job.JobContainer.initJobReader(JobContainer.java:661)
at com.alibaba.datax.core.job.JobContainer.init(JobContainer.java:303)
at com.alibaba.datax.core.job.JobContainer.start(JobContainer.java:113)
at com.alibaba.datax.core.Engine.start(Engine.java:92)
at com.alibaba.datax.core.Engine.entry(Engine.java:171)
at com.alibaba.datax.core.Engine.main(Engine.java:204)
Caused by: java.lang.ClassNotFoundException: com.alibaba.datax.plugin.reader.otsstreamreader.internal.OTSStreamReader$Job
at java.net.URLClassLoader.findClass(URLClassLoader.java:387)
at java.lang.ClassLoader.loadClass(ClassLoader.java:418)
at java.lang.ClassLoader.loadClass(ClassLoader.java:351)
at com.alibaba.datax.core.util.container.LoadUtil.loadPluginClass(LoadUtil.java:173)
... 7 more

Start with the LoadUtil.loadPluginClass and LoadUtil.loadJobPlugin stack entries, then inspect how the OTSStreamReader$Job class is packaged and loaded. Reproduce the DataX job and verify that com.alibaba.datax.plugin.reader.otsstreamreader.internal.OTSStreamReader$Job is available to the runtime without the ClassNotFoundException.

Written by the indexing model from the issue text.