android studio cant build

Question

失败：构建因异常而失败。

出了什么问题：任务执行失败＆＃39;：app：preDexDebug＆＃39;。

java.io.IOException: Cannot run program "C:\Users\SETIAWAN\AppData\Local\Android\sdk\build-tools\21.1.2\dx.bat": 
CreateProcess error=2, The system cannot find the file specified
Try: Run with --stacktrace option to get the stack trace. Run with -- info or --debug option to get more log output.

BUILD FAILED

Total time: 1 mins 12.109 secs

任何人都可以提供帮助。当我尝试运行dx.bat时。错误Windows无法找到此文件（dx.bat）

Answer 1

您可以多次添加android-support-v4.jar。从项目的build.gradle中删除android-support-v4.jar的依赖项，只有一个依赖项，例如：

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    compile 'com.android.support:appcompat-v7:21.0.3'
}