admob app is approved and the status is ready, but ads cannot be displayed.

[熊煊华]

{
 "Code": 0,
 "Message": "Internal error.",
 "Domain": "com.google.android.gms.ads",
 "Cause": "null",
 "Response Info": {
  "Response ID": "b_1JZsGvEcbBvcAP-7qG-AM",
  "Mediation Adapter Class Name": "",
  "Adapter Responses": [
   {
    "Adapter": "com.google.ads.mediation.admob.AdMobAdapter",
    "Latency": 60001,
    "Ad Source Name": "AdMob Network",
    "Ad Source ID": "545021321328******",
    "Ad Source Instance Name": "AdMob (default)",
    "Ad Source Instance ID": "",
    "Credentials": {
     "pubid": "ca-app-pub-23296257146*****/93653*****/cak=no_cache&cadc=d8&caqid=b_1JZrzQEJ2Npt8PhfaXuA0"
    },
    "Ad Error": {
     "Code": 0,
     "Message": "Internal error.",
     "Domain": "com.google.android.gms.ads",
     "Cause": "null"
    }
   }
  ],
  "Response Extras": {
   "mediation_group_name": "AdMob (default)"
  }
 }
}

{
 "Response ID": "b_1JZsGvEcbBvcAP-7qG-AM",
 "Mediation Adapter Class Name": "",
 "Adapter Responses": [
  {
   "Adapter": "com.google.ads.mediation.admob.AdMobAdapter",
   "Latency": 60001,
   "Ad Source Name": "AdMob Network",
   "Ad Source ID": "54502132132861*****",
   "Ad Source Instance Name": "AdMob (default)",
   "Ad Source Instance ID": "",
   "Credentials": {
    "pubid": "ca-app-pub-23296257146*****/93653*****/cak=no_cache&cadc=d8&caqid=b_1JZrzQEJ2Npt8PhfaXuA0"
   },
   "Ad Error": {
    "Code": 0,
    "Message": "Internal error.",
    "Domain": "com.google.android.gms.ads",
    "Cause": "null"
   }
  }
 ],
 "Response Extras": {
  "mediation_group_name": "AdMob (default)"
 }
}