Android - No implementation found for void

I’ve loaded many APK’s to Google playstore but for some reason I am now getting the following error causing the game to stop shortly after loading.

I can’t think of anything new I’ve added to cause the error.

Any ideas??

02-15 10:17:25.221 12803 12803 **E t.PlayCallerPF: No implementation found for void** com.epicgames.ue4.t0.a(int, java.lang.String[], java.lang.String[], java.lang.String[], java.lang.String[], float[], java.lang.String[], java.lang.String[]) (tried Java_com_epicgames_ue4_t0_a and Java_com_epicgames_ue4_t0_a__I_3Ljava_lang_String_2_3Ljava_lang_String_2_3Ljava_lang_String_2_3Ljava_lang_String_2_3F_3Ljava_lang_String_2_3Ljava_lang_String_2)
02-15 10:17:25.224 12803 12803 D AndroidRuntime: Shutting down VM
02-15 10:17:25.230 12803 12803 E AndroidRuntime: FATAL EXCEPTION: MainThread-UE4
02-15 10:17:25.230 12803 12803 E AndroidRuntime: Process: com.Mojosoft.PlayCallerPFF, PID: 12803
02-15 10:17:25.230 12803 12803 E AndroidRuntime: java.lang.UnsatisfiedLinkError: No implementation found for void com.epicgames.ue4.t0.a(int, java.lang.String[], java.lang.String[], java.lang.String[], java.lang.String[], float[], java.lang.String[], java.lang.String[]) (tried Java_com_epicgames_ue4_t0_a and Java_com_epicgames_ue4_t0_a__I_3Ljava_lang_String_2_3Ljava_lang_String_2_3Ljava_lang_String_2_3Ljava_lang_String_2_3F_3Ljava_lang_String_2_3Ljava_lang_String_2)
02-15 10:17:25.230 12803 12803 E AndroidRuntime: 	at com.epicgames.ue4.t0.a(Native Method)
02-15 10:17:25.230 12803 12803 E AndroidRuntime: 	at com.epicgames.ue4.k0.a(Unknown Source:549)
02-15 10:17:25.230 12803 12803 E AndroidRuntime: 	at com.android.billingclient.api.g.run(Unknown Source:36)
02-15 10:17:25.230 12803 12803 E AndroidRuntime: 	at android.os.Handler.handleCallback(Handler.java:873)
02-15 10:17:25.230 12803 12803 E AndroidRuntime: 	at android.os.Handler.dispatchMessage(Handler.java:99)
02-15 10:17:25.230 12803 12803 E AndroidRuntime: 	at android.os.Looper.loop(Looper.java:235)
02-15 10:17:25.230 12803 12803 E AndroidRuntime: 	at android.app.ActivityThread.main(ActivityThread.java:6760)
02-15 10:17:25.230 12803 12803 E AndroidRuntime: 	at java.lang.reflect.Method.invoke(Native Method)
02-15 10:17:25.230 12803 12803 E AndroidRuntime: 	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
02-15 10:17:25.230 12803 12803 E AndroidRuntime: 	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:911)