android studio: Could not find any version that matches com.android.support:appcompat-v7:29.+.

问题: 今天新安装android studio3.1.2,之后创建新的工程,但是出现了一些错误提示,提示如下: Unable to resolve dependency for ':[email protected]/compileClasspath': Could not find any version that matches com.android.support:appcompat-v7
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