Mock REST, error log shows, "Missing start boundary", when client request with binary attachment

Hello,

 

I just notice from my SOAPUI (5.3.0) that when a client send a POST request to my REST mock service, SOAPUI is showing the error below. How can I fix this on SOAPUI side, as the actual request from the client is not an issue to a live REST server?  (I am using mock server for load test because I am not allow to load test on live server).

 

Thanks 

 

Tue Sep 11 18:11:29 PDT 2018:ERROR:got an exception while dispatching - returning a default 500 response

Tue Sep 11 18:11:29 PDT 2018:ERROR:javax.mail.MessagingException: Missing start boundary

javax.mail.MessagingException: Missing start boundary
at javax.mail.internet.MimeMultipart.parsebm(MimeMultipart.java:713)
at javax.mail.internet.MimeMultipart.parse(MimeMultipart.java:383)
at javax.mail.internet.MimeMultipart.getCount(MimeMultipart.java:229)
at com.eviware.soapui.impl.wsdl.submit.transports.http.support.attachments.MultipartMessageSupport.<init>(MultipartMessageSupport.java:60)
at com.eviware.soapui.impl.support.AbstractMockRequest.readMultipartRequest(AbstractMockRequest.java:134)
at com.eviware.soapui.impl.support.AbstractMockRequest.initPostRequest(AbstractMockRequest.java:102)
at com.eviware.soapui.impl.support.AbstractMockRequest.<init>(AbstractMockRequest.java:93)
at com.eviware.soapui.impl.rest.mock.RestMockRequest.<init>(RestMockRequest.java:29)
at com.eviware.soapui.impl.rest.mock.RestMockDispatcher.dispatchRequest(RestMockDispatcher.java:45)
at com.eviware.soapui.impl.wsdl.mock.WsdlMockRunner.dispatchRequest(WsdlMockRunner.java:142)
at com.eviware.soapui.monitor.JettyMockEngine$ServerHandler.handle(JettyMockEngine.java:604)
at org.mortbay.jetty.handler.HandlerCollection.handle(HandlerCollection.java:114)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
at org.mortbay.jetty.Server.handle(Server.java:326)
at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
at org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:945)
at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:756)
at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:218)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:410)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)