Getting noClassFoundError libcore while runing the android project -


I am very new to Android. I am developing my first application, simple Hello World to print. The project is running while I'm having the following exception 

  exception in the formula "AsyncQueryWorker" java.lang.NoClassDefFoundError:. libcore / when / on Libcore android.os.Process.myTid (Process.java: java.lang.ClassNotFoundException: libcore.io.Libcore Java android.os.HandlerThread_Delegate.run (HandlerThread_Delegate.java:69) android.os.HandlerThread 670 due to (HandlerThread.java:53) due to .run. On net.URLClassLoader $ 1.run java.net.URLClassLoader.findClass (URLClassLoader.java:205) on java.security.AccessController.doPrivileged (Native Method) (URLClassLoader.java:217) on java.lang.ClassLoader.loadClass (classloader .java: 323) on java.lang.ClassLoader.loadClass (ClassLoader.java:268) ... 3 more

Please help me.

If you Eclipse are:

< Properties

Right click on Java Build Path > Orders and Export

enter image description here

and make sure that All external libraries and dependencies libcore


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