Can't attach file on xdoclet-jira

When I try to attach a xml file to XDT-355, the systems says:
500 Internal Server Error

java.lang.IllegalArgumentException: Prefix string too short
at http.utils.multipartrequest.TempFile.createTempFile(TempFile.java)
at http.utils.multipartrequest.MultipartRequest.parse(MultipartRequest.java)
at http.utils.multipartrequest.MultipartRequest.init(MultipartRequest.java)
at http.utils.multipartrequest.MultipartRequest.<init>(MultipartRequest.java)
at http.utils.multipartrequest.ServletMultipartRequest.<init>(ServletMultipartRequest.java)
at webwork.multipart.PellMultiPartRequest.<init>(PellMultiPartRequest.java:41)
at webwork.multipart.MultiPartRequestWrapper.<init>(MultiPartRequestWrapper.java:51)
at webwork.dispatcher.ServletDispatcher.wrapRequest(ServletDispatcher.java:454)
at webwork.dispatcher.ServletDispatcher.service(ServletDispatcher.java:177)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:336)
at com.evermind[Orion/1.6.0 (build 10770)]._it.doFilter(.:59)