Error WSWS3422E : Can not instantiate the webservice

I deployed a webservice successfully but when I try to invoke the service, I am getting the following exception. Could any body tell me hwat cud went wrong??

WSWS3422E: Error: Can not instantiate WTS.webservices.WTSFeedWebService.
      at com.ibm.ws.webservices.engine.dispatchers.java.JavaBeanDispatcher.createServiceObject(JavaBeanDispatcher.java:207)
      at com.ibm.ws.webservices.engine.dispatchers.java.SessionDispatcher.createAndInitServiceObject(SessionDispatcher.java:253)
      at com.ibm.ws.webservices.engine.dispatchers.java.SessionDispatcher.invoke(SessionDispatcher.java:201)
      at com.ibm.ws.webservices.engine.PivotHandlerWrapper.invoke(PivotHandlerWrapper.java:228)
      at com.ibm.ws.webservices.engine.handlers.jaxrpc.JAXRPCHandler.invoke(JAXRPCHandler.java:152)
      at com.ibm.ws.webservices.engine.handlers.WrappedHandler.invoke(WrappedHandler.java:64)
      at com.ibm.ws.webservices.engine.PivotHandlerWrapper.invoke(PivotHandlerWrapper.java:228)
      at com.ibm.ws.webservices.engine.PivotHandlerWrapper.invoke(PivotHandlerWrapper.java:228)
      at com.ibm.ws.webservices.engine.WebServicesEngine.invoke(WebServicesEngine.java:336)
      at com.ibm.ws.webservices.engine.transport.http.WebServicesServlet.doPost(WebServicesServlet.java:831)
      at javax.servlet.http.HttpServlet.service(HttpServlet.java:763)
      at com.ibm.ws.webservices.engine.transport.http.WebServicesServletBase.service(WebServicesServletBase.java:341)
      at javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
      at com.ibm.ws.webcontainer.servlet.ServletWrapper.service(ServletWrapper.java:1068)
      at com.ibm.ws.webcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:543)
      at com.ibm.ws.wswebcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:478)
      at com.ibm.ws.webcontainer.servlet.CacheServletWrapper.handleRequest(CacheServletWrapper.java:90)
      at com.ibm.ws.webcontainer.WebContainer.handleRequest(WebContainer.java:744)
      at com.ibm.ws.wswebcontainer.WebContainer.handleRequest(WebContainer.java:1455)
      at com.ibm.ws.webcontainer.channel.WCChannelLink.ready(WCChannelLink.java:115)
      at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleDiscrimination(HttpInboundLink.java:454)
      at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleNewInformation(HttpInboundLink.java:383)
      at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.ready(HttpInboundLink.java:263)
      at com.ibm.ws.tcp.channel.impl.NewConnectionInitialReadCallback.sendToDiscriminators(NewConnectionInitialReadCallback.java:214)
      at com.ibm.ws.tcp.channel.impl.NewConnectionInitialReadCallback.complete(NewConnectionInitialReadCallback.java:113)
      at com.ibm.ws.tcp.channel.impl.AioReadCompletionListener.futureCompleted(AioReadCompletionListener.java:165)
      at com.ibm.io.async.AbstractAsyncFuture.invokeCallback(AbstractAsyncFuture.java:217)
      at com.ibm.io.async.AsyncChannelFuture.fireCompletionActions(AsyncChannelFuture.java:161)
      at com.ibm.io.async.AsyncFuture.completed(AsyncFuture.java:136)
      at com.ibm.io.async.ResultHandler.complete(ResultHandler.java:195)
      at com.ibm.io.async.ResultHandler.runEventProcessingLoop(ResultHandler.java:743)
      at com.ibm.io.async.ResultHandler$2.run(ResultHandler.java:873)
      at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:1473)
Caused by: java.lang.InstantiationException: WTS.webservices.WTSFeedWebService
      at java.lang.Class.newInstance0(Class.java:335)
      at java.lang.Class.newInstance(Class.java:303)