Unable to get package info for com.example.sampletest; is package not installed?

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 Unable to instantiate application com.android.activity.BaseApplication: java.lang.IllegalStateException: Unable to get package info for com.example.sampletest; is package not installed?            at android.app.LoadedApk.makeApplication(LoadedApk.java:509)            at android.app.ActivityThread.handleBindApplication(ActivityThread.java:4334)            at android.app.ActivityThread.access$1500(ActivityThread.java:138)            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1259)            at android.os.Handler.dispatchMessage(Handler.java:102)            at android.os.Looper.loop(Looper.java:136)            at android.app.ActivityThread.main(ActivityThread.java:5034)            at java.lang.reflect.Method.invokeNative(Native Method)            at java.lang.reflect.Method.invoke(Method.java:515)            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:807)            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:623)            at dalvik.system.NativeStart.main(Native Method)

这个问题引起原因是简单的卸载app 没有卸载干净，然后再次运行,当dalvik重新安装。apk文件并试图重用以前的活动从同一个包

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