运行java文件时报错：
Error exists in required project
Proceed with launch?
报错截图：
问题参生原因：开始Buildpath了一个jar，然后把这个jar包又删除了
解决方法：进入Configure Build Path，可以看到要给jar包找不到了，要么引入该jar包，要么删除该jar包
eclipse——Error exists in required project Proceed with launch?
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errors exist in required project(s) xxx proceed with launch?
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