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我在 Framework 3.5 中创建了我的第一个项目,然后我转换到了 framework 4.5 并且它工作得很好。其次,我尝试将此项目的引用添加到在框架 4.5 中创建的另一个项目中。在添加引用后构建我的第二个项目时,我收到一条错误消息:

1. The primary reference "xxx" could not be resolved because it was built against the ".NETFramework,Version=v4.5" framework. This is a higher version than the currently targeted framework ".NETFramework,Version=v3.5".
2. The type or namespace name 'xxx' could not be found (are you missing a using directive or an assembly reference?)

请建议我在哪里遗漏了什么

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