我的小程序引用了sdk 0.4.8版本，先调用了微信支付接口，然后在支付回调验证签名时报错如下：

com.wechat.pay.contrib.apache.httpclient.exception.ValidationException: 验签失败：

6 ] sign=[Tfl3thqrvJ2/iw5+TA49U4E2yMkkAgWEwHlSy4OO384NtCuDC8Bc3fTCKyaI251JY1nuZ120H1EI88qQ/FQNprjZvQuBFCIn1xZ4LPi0sjkHf9vDfFqnKciSFfs1/niWSIt7o4hGp5zEdVfmQMlO5obom1y0quQS+gu4P5Yf9vPg58+dBBRIC693fLLW4Q+FlxuN902hGUv6zixwNRrwYZl5njsum4cwyvsA91aCo513CRzMj+PMvZjGAKPE6METwtivkGDZMLuFK/r/BanPotNc6TitmXFCac0GhxHUmDwhw3KSgeHNvj6YpFbUDAr1MgwAmKxHTVk9OTMIxAQ8fw==]

7         at com.wechat.pay.contrib.apache.httpclient.notification.NotificationHandler.validate(NotificationHandler.java:70)

8         at com.wechat.pay.contrib.apache.httpclient.notification.NotificationHandler.parse(NotificationHandler.java:46)

9         at cn.tongdun.groupon.portal.web.controller.weixin.WeixinCallBackController.pay(WeixinCallBackController.java:114)

10         at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

11         at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)

12         at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

13         at java.lang.reflect.Method.invoke(Method.java:498)

14         at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:209)

15         at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:136)

16         at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:102)

17         at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:870)

18         at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:776)

19         at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)

20         at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:991)

21         at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:925)

22         at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:978)

23         at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:881)

24         at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)

25         at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:855)

26         at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)

27         at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)

28         at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)

29         at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)

30         at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)

31         at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)

32         at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99)

33         at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)

34         at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)

35         at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)

36         at org.springframework.web.filter.HttpPutFormContentFilter.doFilterInternal(HttpPutFormContentFilter.java:109)

37         at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)

38         at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)

39         at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)

40         at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:81)

41         at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)

42         at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)

43         at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)

44         at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:200)

45         at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)

46         at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)

47         at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)

48         at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:199)

49         at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)

50         at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:496)

51         at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)

52         at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81)

53         at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)

54         at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:650)

55         at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342)

56         at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:803)

57         at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)

58         at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:790)

59         at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1459)

60         at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)

61         at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)

62         at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)

63         at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)

64         at java.lang.Thread.run(Thread.java:750)