java.lang.NullPointerException: Attempt to invoke a virtual method on a null object reference

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java.lang.NullPointerException: Attempt to invoke a virtual method on a null object reference
at com.antfortune.freeline.FreelineCore.getApkBuildFlag(FreelineCore.java:156)
at com.antfortune.freeline.FreelineCore.getUuid(FreelineCore.java:406)
at com.antfortune.freeline.FreelineReceiver.onReceive(FreelineReceiver.java:36)
at android.app.ActivityThread.handleReceiver(ActivityThread.java:2749)
at android.app.ActivityThread.access$1700(ActivityThread.java:169)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1500)
at android.os.Handler.dispatchMessage(Handler.java:111)
at android.os.Looper.loop(Looper.java:194)
at android.app.ActivityThread.main(ActivityThread.java:5546)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:967)

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