java.lang.NullPointerException: Attempt to invoke interface method 'void earn.free.cashback.snapcash.MainActivity$hell.willwork()' on a null object reference

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Attempt to invoke interface method 'void earn.free.cashback.snapcash.MainActivity$hell.willwork()' on a null object reference
java.lang.NullPointerException: Attempt to invoke interface method 'void earn.free.cashback.snapcash.MainActivity$hell.willwork()' on a null object reference
at earn.free.cashback.snapcash.MainActivity$2.onPageSelected(MainActivity.java:152)
at android.support.v4.view.ViewPager.dispatchOnPageSelected(ViewPager.java:1856)
at android.support.v4.view.ViewPager.scrollToItem(ViewPager.java:625)
at android.support.v4.view.ViewPager.setCurrentItemInternal(ViewPager.java:609)
at android.support.v4.view.ViewPager.setCurrentItemInternal(ViewPager.java:570)

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