Run ‘app’后出现以下错误，才刚开始学，不懂，请问怎么解决？
Error:Execution failed for task ':app:transformClassesWithDexForDebug'.
com.android.ide.common.process.ProcessException: org.gradle.process.internal.ExecException: Process 'command 'C:\Program Files\Java\jdk1.7.0_11\bin\java.exe'' finished with non-zero exit value 1
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