错误：Gradle sync failed: Could not download junit.jar (junit:junit:4.12): No cached version available

1.错误：Gradle sync failed: Could not download junit.jar (junit:junit:4.12): No cached version available for 解决方案： 1.setting->查找Gradle,在页面内将如下图所示的勾选去掉，点击ok 3.“Build"->"clean Project" 会出现如下所示错误提示： Error:A

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