pay using citrus cash Crash

crash_wallet_pay

E/AndroidRuntime﹕ FATAL EXCEPTION: main
    java.lang.NullPointerException
            at com.citrus.sdk.CitrusActivity.prepaidPayment(CitrusActivity.java:297)
            at com.citrus.sdk.CitrusActivity.access$600(CitrusActivity.java:66)
            at com.citrus.sdk.CitrusActivity$3.onTaskexecuted(CitrusActivity.java:236)
            at com.citrus.payment.PG$2.success(PG.java:451)
            at com.citrus.payment.PG$2.success(PG.java:446)
            at retrofit.CallbackRunnable$1.run(CallbackRunnable.java:45)
            at android.os.Handler.handleCallback(Handler.java:725)
            at android.os.Handler.dispatchMessage(Handler.java:92)
            at android.os.Looper.loop(Looper.java:153)
            at android.app.ActivityThread.main(ActivityThread.java:5297)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:511)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:833)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600)
            at dalvik.system.NativeStart.main(Native Method)