Unable to resolve dependency for ':app@debug/compileClasspath': Could not find any version that matc

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Unable to resolve dependency for ':app@debug/compileClasspath': Could not find any version that matches com.android.support:appcompat-v7:29.+.
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Unable to resolve dependency for ':app@debugAndroidTest/compileClasspath': Could not find any version that matches com.android.support:appcompat-v7:29.+.
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Unable to resolve dependency for ':app@debugUnitTest/compileClasspath': Could not find any version that matches com.android.support:appcompat-v7:29.+.
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Unable to resolve dependency for ':app@release/compileClasspath': Could not find any version that matches com.android.support:appcompat-v7:29.+.
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Unable to resolve dependency for ':app@releaseUnitTest/compileClasspath': Could not find any version that matches com.android.support:appcompat-v7:29.+.
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解决;

1、网上试了各种办法不行

2、无非是引用的包无法匹配。

3、project structure ——>app   [property]-----【后续的其他几个有version 的保持一致】

选择特定的 sdk。  这里选择 8.1，   原因不明：之前9.1 都是可以的， 重装系统后，不行了。 反正这样能够编译ok；

4、注意gradle文件是否自动修改，如果没有同步修改， 还需要手动修改

【比如，我这里手动改为27】

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初入，安卓坑，原因不明。。