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java.lang.NullPointerException: 	at android.app.ContextImpl.openFileOutput(ContextImpl.java:729)	at android.content.ContextWrapper.openFileOutput(ContextWrapper.java:179)	at com.mobfox.sdk.utils.Utils.write(Utils.java:107)	at com.mobfox.sdk.dmp.DMP.update(DMP.java:93)	at com.mobfox.sdk.dmp.DMPManager.updateDMP(DMPManager.java:26)	at com.mobfox.sdk.bannerads.Banner.postDMP(Banner.java:510)	at com.mobfox.sdk.bannerads.Banner.init(Banner.java:347)	at com.mobfox.sdk.bannerads.Banner.load(Banner.java:375)	at com.mobfox.sdk.interstitialads.InterstitialAd.load(InterstitialAd.java:288)	at com.frostwire.android.offers.MobFoxAdNetwork$1.run(MobFoxAdNetwork.java:156)	at android.os.Handler.handleCallback(Handler.java:730)	at android.os.Handler.dispatchMessage(Handler.java:92)	at android.os.Looper.loop(Looper.java:152)	at android.app.ActivityThread.main(ActivityThread.java:5136)	at java.lang.reflect.Method.invokeNative(Native Method)	at java.lang.reflect.Method.invoke(Method.java:525)	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:744)	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)	at dalvik.system.NativeStart.main(Native Method)