本地正常运行，但放到服务器端无法运行 500错误如图：
错误截图
Whitelabel Error Page
This application has no explicit mapping for /error, so you are seeing this as a fallback.
Wed Aug 23 16:22:27 CST 2017
There was an unexpected error (type=Internal Server Error, status=500).
Error resolving template "/teacher/sign_in/main", template might not exist or might not be accessible by any of the configured Template Resolvers
解决办法：
报错 500 表示没能找到这个路径"/teacher/sign_in/main"，所以经过仔细检查，我发现正确的路径应该为："teacher/sign_in/main" 即根目录不应该添加/ ， 经过修复改正。奇怪的是本地竟然是正常的。
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