java.lang.NullPointerException

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    • java.lang.NullPointerException: Attempt to invoke virtual method 'void android.support.v7.widget.Toolbar.setBackgroundColor(int)' on a null object reference at com.example.xinthe.viewpagerdemo.FirstFragment.setToolbarColour(FirstFragment.java:67) at com.example.xinthe.viewpagerdemo.MainActivity.onClick(MainActivity.java:99) at android.view.View.performClick(View.java:5612) at android.view.View$PerformClick.run(View.java:22285) at android.os.Handler.handleCallback(Handler.java:751) at android.os.Handler.dispatchMessage(Handler.java:95) at android.os.Looper.loop(Looper.java:154) at android.app.ActivityThread.main(ActivityThread.java:6123) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:867) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:757)
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