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

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
eclipse: the project cannot be built until its prerequisite 问题解决_第1张图片
看到 Error log 报错:

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

这个时候选择

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

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