在执行下面的代码的时候出现了“Unable to load the job from XML file”问题

执行代码：

            JobMeta jobMeta = new JobMeta(log, jobFileName, null);

异常信息：

org.pentaho.di.core.exception.KettleXMLException: 
Unable to load the job from XML file [file:///D:/credit/hldzxjb/ep_yw.kjb]

Unable to load job info from XML node

Unable to read Job Entry copy info from XML node : org.pentaho.di.core.exception.KettleStepLoaderException: 
No valid step/plugin specified (jobPlugin=null) for TRANS


No valid step/plugin specified (jobPlugin=null) for TRANS