用JFinal上传文件时报错：Separation boundary was n?报错

@JFinal 你好，想跟你请教个问题：用JFinal上传时报错：java.lang.RuntimeException: java.io.IOException: Separation boundary was not specified
at com.jfinal.upload.MultipartRequest.wrapMultipartRequest(MultipartRequest.java:121)
at com.jfinal.upload.MultipartRequest.<init>(MultipartRequest.java:69)
at com.jfinal.core.Controller.getFiles(Controller.java:625)
at com.jfinal.core.Controller.getFile(Controller.java:637)
at com.skg.controller.tb_shop_returnController.save(tb_shop_returnController.java:92)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at com.jfinal.core.ActionInvocation.invoke(ActionInvocation.java:55)
at com.skg.interceptor.LoginInterceptor.intercept(LoginInterceptor.java:17)
at com.jfinal.core.ActionInvocation.invoke(ActionInvocation.java:51)
at com.skg.interceptor.GlobalInterceptor.intercept(GlobalInterceptor.java:30)
at com.jfinal.core.ActionInvocation.invoke(ActionInvocation.java:51)
at com.jfinal.ext.interceptor.SessionInViewInterceptor.intercept(SessionInViewInterceptor.java:44)
at com.jfinal.core.ActionInvocation.invoke(ActionInvocation.java:51)
at com.jfinal.core.ActionHandler.handle(ActionHandler.java:73)
at com.jfinal.core.JFinalFilter.doFilter(JFinalFilter.java:72)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1307)
at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:453)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:137)
at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:560)
at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:231)
at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1072)
at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:382)
at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:193)
at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1006)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:135)
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:116)
at org.eclipse.jetty.server.Server.handle(Server.java:365)
at org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:485)
at org.eclipse.jetty.server.AbstractHttpConnection.content(AbstractHttpConnection.java:937)
at org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.content(AbstractHttpConnection.java:998)
at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:856)
at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:240)
at org.eclipse.jetty.server.AsyncHttpConnection.handle(AsyncHttpConnection.java:82)
at org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:628)
at org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:52)
at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:608)
at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:543)
at java.lang.Thread.run(Thread.java:619)
Caused by: java.io.IOException: Separation boundary was not specified
at com.oreilly.servlet.multipart.MultipartParser.<init>(MultipartParser.java:182)
at com.oreilly.servlet.MultipartRequest.<init>(MultipartRequest.java:223)
at com.jfinal.upload.MultipartRequest.wrapMultipartRequest(MultipartRequest.java:105)
... 40 more

这是哪里的问题