java.lang.NullPointerException: Attempt to invoke virtual method 'void com.example.stins.calculator.CalculatorImpl.numpadClicked(int)' on a null object reference

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    • java.lang.NullPointerException: Attempt to invoke virtual method 'void com.example.stins.calculator.CalculatorImpl.numpadClicked(int)' on a null object reference at com.example.stins.calculator.MainActivity.numpadClicked(MainActivity.java:105) at com.example.stins.calculator.MainActivity.numpadClick(MainActivity.java:101) at com.example.stins.calculator.MainActivity_ViewBinding$16.doClick(MainActivity_ViewBinding.java:192) at butterknife.internal.DebouncingOnClickListener.onClick(DebouncingOnClickListener.java:22) at android.view.View.performClick(View.java:5198) at android.view.View$PerformClick.run(View.java:21147) at android.os.Handler.handleCallback(Handler.java:739) at android.os.Handler.dispatchMessage(Handler.java:95) at android.os.Looper.loop(Looper.java:148) at android.app.ActivityThread.main(ActivityThread.java:5417) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
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