eclipse: the project cannot be built until its prerequisite 问题解决 Eclipse

在确保Eclipse项目文件没有报错的地方之后，项目名上还有红x，这时可以查看Error log 或者 problem，看下问题是什么

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看到 Error log 报错：

the project cannot be built until its prerequisite... rebuild is recommonded

【eclipse: the project cannot be built until its prerequisite 问题解决】这个时候选择

1. Project -> Close Project 2. Project -> Open Project 3. Project -> Clean

eclipse: the project cannot be built until its prerequisite 问题解决