i have a error with my program

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Feb 13, 2017 2:46:43 PM via Website

FATAL EXCEPTION: main
Process: app.job.alerts, PID: 15340
java.lang.NullPointerException: Attempt to invoke virtual method 'java.io.File android.content.Context.getDir(java.lang.String, int)' on a null object reference
at app.job.alerts.utils.Utils.getCacheFile(Utils.java:257)
at app.job.alerts.utils.Utils.saveCacheToSDCard(Utils.java:269)
at app.job.alerts.fragments.LatestPostFragment$6.onResponse(LatestPostFragment.java:395)
at app.job.alerts.fragments.LatestPostFragment$6.onResponse(LatestPostFragment.java:390)
at com.android.volley.toolbox.JsonRequest.deliverResponse(JsonRequest.java:65)
at com.android.volley.ExecutorDelivery$ResponseDeliveryRunnable.run(ExecutorDelivery.java:99)
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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