我收到以下错误：
java.util.NoSuchElementException: No mapping for class java.awt.Toolkit
at com.mercury.bcel.TransformerXmlFile$MappingLocator.setMapping(TransformerXmlFile.java:96)
at com.mercury.bcel.TransformerFactory.createTransformer(TransformerFactory.java:56)
at com.mercury.bcel.TransformerMainImpl.transform(TransformerMainImpl.java:33)
at com.mercury.bcel.TransformerMain.transform(TransformerMain.java:35)
at com.mercury.javashared.transform.TransformersChain.transform(TransformersChain.java:35)
at com.mercury.javashared.transform.CommunicationThread.processTransformRequest(CommunicationThread.java:76)
at com.mercury.javashared.transform.CommunicationThread.run(CommunicationThread.java:42)