Error:Execution failed for task ':app:transformClassesWithDexForDebug'

错误内容如下：

Error:Execution failed for task ':app:transformClassesWithDexForDebug'.> com.android.ide.common.process.ProcessException: org.gradle.process.internal.ExecException: Process 'command '/Library/Java/JavaVirtualMachines/jdk1.8.0_51.jdk/Contents/Home/bin/java'' finished with non-zero exit value 1

莫名其妙的错误，没有解决思路。于是上网搜索，参考了多个方案也没有解决问题。

解决如下：

把gradle的"compile fileTree(dir: 'libs', include: ['*.jar'])"
改成"provided fileTree(dir: 'libs', include: ['*.jar'])".