pub.mime:getEnvelopeStream error

Hi All,

I am trying to create MIME message. I am getting the following Error which I run the example service
I am getting the Error in the STEP : pub.mime:getEnvelopeStream

The Error Message is :

An error occurred while tracing. 
com.wm.app.b2b.server.ServiceException: "text/plain" DataContentHandler requires String object, was given object of type class java.io.ByteArrayInputStream 

In the Server error log I am getting the following Error Stack Trace: 

 com.wm.app.b2b.server.ServiceException: "text/plain" DataContentHandler requires String object, was given object of type class java.io.ByteArrayInputStream com.wm.app.b2b.server.ServiceException: "text/plain" DataContentHandler requires String object, was given object of type class java.io.ByteArrayInputStream 
at pub.mime.getEnvelopeStream(mime.java:234) 
at java.lang.reflect.Method.invoke(Native Method) 
at com.wm.app.b2b.server.JavaService.baseInvoke(JavaService.java(Compiled Code)) 
at com.wm.app.b2b.server.ServiceManager.invoke(ServiceManager.java(Compiled Code)) 
at com.wm.app.b2b.server.BaseService.invoke(BaseService.java:153) 
at com.wm.lang.flow.FlowInvoke.invoke(FlowInvoke.java:324) 
at com.wm.lang.flow.FlowState.invokeNode(FlowState.java:577) 
at com.wm.lang.flow.FlowState.stepIncremental(FlowState.java(Compiled Code)) 
at com.wm.lang.flow.FlowState.invoke(FlowState.java(Compiled Code)) 
at wm.server.flowimpl.stepFlow(flowimpl.java:183) 
at java.lang.reflect.Method.invoke(Native Method) 
at com.wm.app.b2b.server.JavaService.baseInvoke(JavaService.java(Compiled Code)) 
at com.wm.app.b2b.server.ServiceManager.invoke(ServiceManager.java(Compiled Code)) 
at com.wm.app.b2b.server.comm.DefaultServerRequestHandler.handleMessage(DefaultServerRequestHandler.java:97) 
at com.wm.app.b2b.server.HTTPMessageHandler.process(HTTPMessageHandler.java:167) 
at com.wm.app.b2b.server.Dispatch.run(Dispatch.java:204) 
at com.wm.util.pool.PooledThread.run(PooledThread.java:105) 
at java.lang.Thread.run(Thread.java:512) 

I am using webMethods IS & Developer Version 6.5.
Is this a problem with this release or are there any fixed available.

Thanks and regards,
Renuka D