Redmine有svn版本比较功能，当版本比较的diff报error 500错误时，经查找原因如下：
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原因是tmp/cache的权限问题
由于redmine的tmp在root组下，所以需要更改/opt/redmine-2.3.2-2/apps/redmine/htdocs/tmp/cache改为777权限，该问题解决。
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详细解决方案
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