title: How to identify the error in logcat
body: <p>I have some error in logcat but i dont know how to identify it. pls help me to find out this problem. My system crashes after running the emulator. I don't know what is an error in my project.</p>
  
  <p>Thanks in advance.  </p>
  
  <pre><code>02-14 16:45:44.527: D/dalvikvm(562): Not late-enabling CheckJNI (already on)
  02-14 16:45:46.407: I/ActivityThread(562): Pub polito.mailandroid: polito.mailandroid.ui.ElementProvider
  02-14 16:45:46.417: D/AndroidRuntime(562): Shutting down VM
  02-14 16:45:46.417: W/dalvikvm(562): threadid=1: thread exiting with uncaught exception (group=0x409c01f8)
  02-14 16:45:46.487: E/AndroidRuntime(562): FATAL EXCEPTION: main
  02-14 16:45:46.487: E/AndroidRuntime(562): java.lang.RuntimeException: Unable to get provider polito.mailandroid.ui.ElementProvider: java.lang.ClassNotFoundException: polito.mailandroid.ui.ElementProvider
  02-14 16:45:46.487: E/AndroidRuntime(562):  at android.app.ActivityThread.installProvider(ActivityThread.java:4240)
  02-14 16:45:46.487: E/AndroidRuntime(562):  at android.app.ActivityThread.installContentProviders(ActivityThread.java:3992)
  02-14 16:45:46.487: E/AndroidRuntime(562):  at android.app.ActivityThread.handleBindApplication(ActivityThread.java:3946)
  02-14 16:45:46.487: E/AndroidRuntime(562):  at android.app.ActivityThread.access$1300(ActivityThread.java:123)
  02-14 16:45:46.487: E/AndroidRuntime(562):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1185)
  02-14 16:45:46.487: E/AndroidRuntime(562):  at android.os.Handler.dispatchMessage(Handler.java:99)
  02-14 16:45:46.487: E/AndroidRuntime(562):  at android.os.Looper.loop(Looper.java:137)
  02-14 16:45:46.487: E/AndroidRuntime(562):  at android.app.ActivityThread.main(ActivityThread.java:4424)
  02-14 16:45:46.487: E/AndroidRuntime(562):  at java.lang.reflect.Method.invokeNative(Native Method)
  02-14 16:45:46.487: E/AndroidRuntime(562):  at java.lang.reflect.Method.invoke(Method.java:511)
  02-14 16:45:46.487: E/AndroidRuntime(562):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
  02-14 16:45:46.487: E/AndroidRuntime(562):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
  02-14 16:45:46.487: E/AndroidRuntime(562):  at dalvik.system.NativeStart.main(Native Method)
  02-14 16:45:46.487: E/AndroidRuntime(562): Caused by: java.lang.ClassNotFoundException: polito.mailandroid.ui.ElementProvider
  02-14 16:45:46.487: E/AndroidRuntime(562):  at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:61)
  02-14 16:45:46.487: E/AndroidRuntime(562):  at java.lang.ClassLoader.loadClass(ClassLoader.java:501)
  02-14 16:45:46.487: E/AndroidRuntime(562):  at java.lang.ClassLoader.loadClass(ClassLoader.java:461)
  02-14 16:45:46.487: E/AndroidRuntime(562):  at android.app.ActivityThread.installProvider(ActivityThread.java:4225)
  02-14 16:45:46.487: E/AndroidRuntime(562):  ... 12 more
  02-14 16:46:16.637: I/Process(562): Sending signal. PID: 562 SIG: 9
  02-14 17:00:46.667: I/ActivityThread(644): Pub polito.mailandroid: polito.mailandroid.ui.ElementProvider
  02-14 17:00:46.667: D/AndroidRuntime(644): Shutting down VM
  02-14 17:00:46.717: W/dalvikvm(644): threadid=1: thread exiting with uncaught exception (group=0x409c01f8)
  02-14 17:00:46.727: E/AndroidRuntime(644): FATAL EXCEPTION: main
  02-14 17:00:46.727: E/AndroidRuntime(644): java.lang.RuntimeException: Unable to get provider polito.mailandroid.ui.ElementProvider: java.lang.ClassNotFoundException: polito.mailandroid.ui.ElementProvider
  02-14 17:00:46.727: E/AndroidRuntime(644):  at android.app.ActivityThread.installProvider(ActivityThread.java:4240)
  02-14 17:00:46.727: E/AndroidRuntime(644):  at android.app.ActivityThread.installContentProviders(ActivityThread.java:3992)
  02-14 17:00:46.727: E/AndroidRuntime(644):  at android.app.ActivityThread.handleBindApplication(ActivityThread.java:3946)
  02-14 17:00:46.727: E/AndroidRuntime(644):  at android.app.ActivityThread.access$1300(ActivityThread.java:123)
  02-14 17:00:46.727: E/AndroidRuntime(644):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1185)
  02-14 17:00:46.727: E/AndroidRuntime(644):  at android.os.Handler.dispatchMessage(Handler.java:99)
  02-14 17:00:46.727: E/AndroidRuntime(644):  at android.os.Looper.loop(Looper.java:137)
  02-14 17:00:46.727: E/AndroidRuntime(644):  at android.app.ActivityThread.main(ActivityThread.java:4424)
  02-14 17:00:46.727: E/AndroidRuntime(644):  at java.lang.reflect.Method.invokeNative(Native Method)
  02-14 17:00:46.727: E/AndroidRuntime(644):  at java.lang.reflect.Method.invoke(Method.java:511)
  02-14 17:00:46.727: E/AndroidRuntime(644):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
  02-14 17:00:46.727: E/AndroidRuntime(644):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
  02-14 17:00:46.727: E/AndroidRuntime(644):  at dalvik.system.NativeStart.main(Native Method)
  02-14 17:00:46.727: E/AndroidRuntime(644): Caused by: java.lang.ClassNotFoundException: polito.mailandroid.ui.ElementProvider
  02-14 17:00:46.727: E/AndroidRuntime(644):  at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:61)
  02-14 17:00:46.727: E/AndroidRuntime(644):  at java.lang.ClassLoader.loadClass(ClassLoader.java:501)
  02-14 17:00:46.727: E/AndroidRuntime(644):  at java.lang.ClassLoader.loadClass(ClassLoader.java:461)
  02-14 17:00:46.727: E/AndroidRuntime(644):  at android.app.ActivityThread.installProvider(ActivityThread.java:4225)
  02-14 17:00:46.727: E/AndroidRuntime(644):  ... 12 more
  02-14 17:09:00.347: I/ActivityThread(692): Pub polito.mailandroid: polito.mailandroid.ui.ElementProvider
  02-14 17:09:00.437: D/AndroidRuntime(692): Shutting down VM
  02-14 17:09:00.437: W/dalvikvm(692): threadid=1: thread exiting with uncaught exception (group=0x409c01f8)
  02-14 17:09:00.457: E/AndroidRuntime(692): FATAL EXCEPTION: main
  02-14 17:09:00.457: E/AndroidRuntime(692): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{polito.mailandroid.ui/polito.mailandroid.ui.ui.LoginUI}: java.lang.ClassNotFoundException: polito.mailandroid.ui.ui.LoginUI
  02-14 17:09:00.457: E/AndroidRuntime(692):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1880)
  02-14 17:09:00.457: E/AndroidRuntime(692):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981)
  02-14 17:09:00.457: E/AndroidRuntime(692):  at android.app.ActivityThread.access$600(ActivityThread.java:123)
  02-14 17:09:00.457: E/AndroidRuntime(692):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147)
  02-14 17:09:00.457: E/AndroidRuntime(692):  at android.os.Handler.dispatchMessage(Handler.java:99)
  02-14 17:09:00.457: E/AndroidRuntime(692):  at android.os.Looper.loop(Looper.java:137)
  02-14 17:09:00.457: E/AndroidRuntime(692):  at android.app.ActivityThread.main(ActivityThread.java:4424)
  02-14 17:09:00.457: E/AndroidRuntime(692):  at java.lang.reflect.Method.invokeNative(Native Method)
  02-14 17:09:00.457: E/AndroidRuntime(692):  at java.lang.reflect.Method.invoke(Method.java:511)
  02-14 17:09:00.457: E/AndroidRuntime(692):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
  02-14 17:09:00.457: E/AndroidRuntime(692):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
  02-14 17:09:00.457: E/AndroidRuntime(692):  at dalvik.system.NativeStart.main(Native Method)
  02-14 17:09:00.457: E/AndroidRuntime(692): Caused by: java.lang.ClassNotFoundException: polito.mailandroid.ui.ui.LoginUI
  02-14 17:09:00.457: E/AndroidRuntime(692):  at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:61)
  02-14 17:09:00.457: E/AndroidRuntime(692):  at java.lang.ClassLoader.loadClass(ClassLoader.java:501)
  02-14 17:09:00.457: E/AndroidRuntime(692):  at java.lang.ClassLoader.loadClass(ClassLoader.java:461)
  02-14 17:09:00.457: E/AndroidRuntime(692):  at android.app.Instrumentation.newActivity(Instrumentation.java:1023)
  02-14 17:09:00.457: E/AndroidRuntime(692):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1871)
  02-14 17:09:00.457: E/AndroidRuntime(692):  ... 11 more
  </code></pre>