很紧急！！Unable to execute dex: Multiple dex files define ???

Question

上面的问题解决了，删掉libs下的jar文件就可以现在运行报这个错java.lang.NoClassDefFoundError: com.android.volley.toolbox.Volley

Answer 1

日志文件如下，不知道是什么原因报如下错误
08-01 16:33:35.001: E/AndroidRuntime(31240): FATAL EXCEPTION: main
08-01 16:33:35.001: E/AndroidRuntime(31240): Process: cn.phonecms.main, PID: 31240
08-01 16:33:35.001: E/AndroidRuntime(31240): java.lang.NoClassDefFoundError: com.android.volley.toolbox.Volley
08-01 16:33:35.001: E/AndroidRuntime(31240):  at cn.phonecms.main.LoginActivity.onCreate(LoginActivity.java:42)
08-01 16:33:35.001: E/AndroidRuntime(31240):  at android.app.Activity.performCreate(Activity.java:5426)
08-01 16:33:35.001: E/AndroidRuntime(31240):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1105)
08-01 16:33:35.001: E/AndroidRuntime(31240):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2269)
08-01 16:33:35.001: E/AndroidRuntime(31240):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2363)
08-01 16:33:35.001: E/AndroidRuntime(31240):  at android.app.ActivityThread.access$900(ActivityThread.java:161)
08-01 16:33:35.001: E/AndroidRuntime(31240):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1265)
08-01 16:33:35.001: E/AndroidRuntime(31240):  at android.os.Handler.dispatchMessage(Handler.java:102)
08-01 16:33:35.001: E/AndroidRuntime(31240):  at android.os.Looper.loop(Looper.java:157)
08-01 16:33:35.001: E/AndroidRuntime(31240):  at android.app.ActivityThread.main(ActivityThread.java:5356)
08-01 16:33:35.001: E/AndroidRuntime(31240):  at java.lang.reflect.Method.invokeNative(Native Method)
08-01 16:33:35.001: E/AndroidRuntime(31240):  at java.lang.reflect.Method.invoke(Method.java:515)
08-01 16:33:35.001: E/AndroidRuntime(31240):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1265)
08-01 16:33:35.001: E/AndroidRuntime(31240):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1081)
08-01 16:33:35.001: E/AndroidRuntime(31240):  at dalvik.system.NativeStart.main(Native Method)