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一个老的项目，前两个月还可以打包成功。突然打包失败了。

记录一下解决过程：

1、jcenter()已失效，改为mavenCentral()

添加阿里云镜像:

<code>            google()
            mavenCentral()
	    maven { url 'https://maven.aliyun.com/nexus/content/groups/public/' }
            maven { url 'https://maven.aliyun.com/nexus/content/repositories/jcenter' }
 </code>

2、Installed Build Tools revision 31.0.0 is corrupted

1. go to the location "C:\Users\user\AppData\Local\Android\Sdk\build-tools\31.0.0"
2. find a file named d8.bat. This is a Windows batch file.
3. rename d8.bat to dx.bat.
4. in the folder lib (“C:\Users\user\AppData\Local\Android\Sdk\build-tools\31.0.0\lib”)
5. rename d8.jar to dx.jar