Exception

java.lang.RuntimeException: Unable to resume activity {MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String java.io.File.getName()' on a null object reference
    at android.app.ActivityThread.performResumeActivity(ActivityThread.java:3317)
    at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:3348)
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1535)
    at android.os.Handler.dispatchMessage(Handler.java:111)
    at android.os.Looper.loop(Looper.java:207)
    at android.app.ActivityThread.main(ActivityThread.java:5774)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:789)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:679)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String java.io.File.getName()' on a null object reference
    at acm.a(DownloadedFragment.java:267)
    at acm.onResume(DownloadedFragment.java:197)
    at android.support.v4.app.Fragment.c(Fragment.java:2238)
    at dn.a(FragmentManager.java:1346)
    at dn.a(FragmentManager.java:1528)
    at dn.a(FragmentManager.java:1595)
    at dn.dispatchResume(FragmentManager.java:2914)
    at dk.dispatchResume(FragmentController.java:223)
    at di.onResumeFragments(FragmentActivity.java:509)
    at di.onPostResume(FragmentActivity.java:498)
    at mt.onPostResume(AppCompatActivity.java:172)
    at android.app.Activity.performResume(Activity.java:6408)
    at android.app.ActivityThread.performResumeActivity(ActivityThread.java:3302)
    ... 8 more
java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String java.io.File.getName()' on a null object reference
    at acm.a(DownloadedFragment.java:267)
    at acm.onResume(DownloadedFragment.java:197)
    at android.support.v4.app.Fragment.c(Fragment.java:2238)
    at dn.a(FragmentManager.java:1346)
    at dn.a(FragmentManager.java:1528)
    at dn.a(FragmentManager.java:1595)
    at dn.dispatchResume(FragmentManager.java:2914)
    at dk.dispatchResume(FragmentController.java:223)
    at di.onResumeFragments(FragmentActivity.java:509)
    at di.onPostResume(FragmentActivity.java:498)
    at mt.onPostResume(AppCompatActivity.java:172)
    at android.app.Activity.performResume(Activity.java:6408)
    at android.app.ActivityThread.performResumeActivity(ActivityThread.java:3302)
    at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:3348)
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1535)
    at android.os.Handler.dispatchMessage(Handler.java:111)
    at android.os.Looper.loop(Looper.java:207)
    at android.app.ActivityThread.main(ActivityThread.java:5774)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:789)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:679)
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