在银联官网下载了一个支付接口demo，测试出现报文格式错误，不知哪里错了，请问有大神知道吗？

这是日志文件：

2016-03-30 16:24:06, INFO, ::1, File[ D:\wamp\wamp\www\upacp_demo_b2b\sdk\secureUtil.php ], Line[16]------ =====签名报文开始======
2016-03-30 16:24:06, INFO, ::1, File[ D:\wamp\wamp\www\upacp_demo_b2b\sdk\secureUtil.php ], Line[22]------ 签名key=val&...串 >accessType=0&backUrl=http://115.28.88.181/upacp_demo_b2b/demo...
2016-03-30 16:24:06, INFO, ::1, File[ D:\wamp\wamp\www\upacp_demo_b2b\sdk\secureUtil.php ], Line[25]------ 摘要sha1x16 >5a615909135ea2c2b7066056f071678acf0b5d9b
2016-03-30 16:24:06, INFO, ::1, File[ D:\wamp\wamp\www\upacp_demo_b2b\sdk\secureUtil.php ], Line[32]------ 签名串为 >UnvLiNqmrnhFMH2leQr4rS1Dx826N9dhdLEcBLaSVc6AfE/2/lQFZfWjTRwl6uJNLSdXoSmr/w3B2nAzLRmo2mb/sfy3E3dFxs2iq4dSOOZcJokKySADVwCB9FrNO32r31Hs5YxHnI9JYl2vfoHsN9osE6l4D5V1sKeRqXnj8f7JFDTRHDgwAFuyekcDr7LLilta5AsYSOiNykfqLz/mad49Xcur6W18Vlc5rP/dvXR3lhYU/fV5xvqeTUzFDqrVRfPOaIlbOFAPy6WzgS1hdEsCrLyKwaEyG0gv+5tKmNRYsLGDEuMThEOn6Gy5voFdjDroFbHtHYukP0rSkOuyEA==
2016-03-30 16:24:06, INFO, ::1, File[ D:\wamp\wamp\www\upacp_demo_b2b\sdk\secureUtil.php ], Line[37]------ =====签名报文结束======
2016-03-30 16:24:06, INFO, ::1, File[ D:\wamp\wamp\www\upacp_demo_b2b\sdk\acp_service.php ], Line[154]------ 自动跳转html>