java.lang.NullPointerException: Attempt to invoke interface method 'void queendevelopers.com.communicate.MyFragmentInterface.setResult(java.lang.String)' on a null object reference

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Attempt to invoke interface method 'void queendevelopers.com.communicate.MyFragmentInterface.setResult(java.lang.String)' on a null object reference
java.lang.NullPointerException: Attempt to invoke interface method 'void queendevelopers.com.communicate.MyFragmentInterface.setResult(java.lang.String)' on a null object reference
at queendevelopers.com.communicate.FragmentA$1.onClick(FragmentA.java:34)
at android.view.View.performClick(View.java:4832)
at android.view.View$PerformClick.run(View.java:19844)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5319)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1016)

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