java.lang.AbstractMethodError: abstract method "void com.facebook.ads.internal.api.AudienceNetworkAdsApi.onContentProviderCreated(android.content.Context)"
at com.facebook.ads.internal.dynamicloading.DynamicLoaderFactory.doCallInitialize(DynamicLoaderFactory.java:160)
at com.facebook.ads.internal.dynamicloading.DynamicLoaderFactory.access$200(DynamicLoaderFactory.java:41)
at com.facebook.ads.internal.dynamicloading.DynamicLoaderFactory$1.run(DynamicLoaderFactory.java:122)
at java.lang.Thread.run(Thread.java:919)