I am developing an android app , I want to show banner ads in my app .My previous apps works correctly and the ads are shown . When I create my new app ads did not show even in the old apps

it shows ads failed to load ad:3

this what is shown in the logcat

```
11-29 18:52:54.831: D/ViewRootImpl(31298): ViewPostImeInputStage processPointer 0
11-29 18:52:54.921: D/ViewRootImpl(31298): ViewPostImeInputStage processPointer 1
11-29 18:52:54.921: I/Timeline(31298): Timeline: Activity_launch_request id:apps.s.r.sh time:126574535
11-29 18:52:54.951: W/ResourcesManager(31298): getTopLevelResources: /data/app/apps.s.r.sh-1/base.apk / 1.0 running in apps.s.r.sh rsrc of package null
11-29 18:52:54.951: W/ResourcesManager(31298): getTopLevelResources: /data/app/apps.s.r.sh-1/base.apk / 1.0 running in apps.s.r.sh rsrc of package null
11-29 18:52:55.241: D/SecWifiDisplayUtil(31298): Metadata value : none
11-29 18:52:55.251: D/ViewRootImpl(31298): #1 mView = com.android.internal.policy.PhoneWindow$DecorView{b1e1489 I.E...... R.....ID 0,0-0,0}
11-29 18:52:55.571: W/DisplayListCanvas(31298): DisplayListCanvas is started on unbinded RenderNode (without mOwningView)
11-29 18:52:55.591: D/ViewRootImpl(31298): MSG_RESIZED_REPORT: ci=Rect(0, 72 - 0, 0) vi=Rect(0, 72 - 0, 0) or=1
11-29 18:52:55.851: I/Timeline(31298): Timeline: Activity_idle id: android.os.BinderProxy@1308390 time:126575466
11-29 18:52:55.861: V/ActivityThread(31298): updateVisibility : ActivityRecord{c3eecaf token=android.os.BinderProxy@2057663 {apps.s.r.sh/apps.s.r.sh.MainActivity}} show : false
11-29 18:52:56.921: D/ViewRootImpl(31298): ViewPostImeInputStage processPointer 0
11-29 18:52:56.991: D/ViewRootImpl(31298): ViewPostImeInputStage processPointer 1
11-29 18:52:57.001: I/Timeline(31298): Timeline: Activity_launch_request id:apps.s.r.sh time:126576611
11-29 18:52:57.031: W/ResourcesManager(31298): getTopLevelResources: /data/app/apps.s.r.sh-1/base.apk / 1.0 running in apps.s.r.sh rsrc of package null
11-29 18:52:57.031: W/ResourcesManager(31298): getTopLevelResources: /data/app/apps.s.r.sh-1/base.apk / 1.0 running in apps.s.r.sh rsrc of package null
11-29 18:52:57.081: W/ResourcesManager(31298): getTopLevelResources: /data/app/com.google.android.gms-1/base.apk / 1.0 running in apps.s.r.sh rsrc of package null
11-29 18:52:57.261: W/DynamiteModule(31298): Failed to load module via V2: java.lang.ClassNotFoundException: Didn't find class "com.google.android.gms.dynamite.DynamiteModule$DynamiteLoaderClassLoader" on path: DexPathList[[zip file "/data/app/apps.s.r.sh-1/base.apk"],nativeLibraryDirectories=[/data/app/apps.s.r.sh-1/lib/arm, /vendor/lib, /system/lib]]
11-29 18:52:57.271: I/DynamiteModule(31298): Considering local module com.google.android.gms.ads.dynamite:0 and remote module com.google.android.gms.ads.dynamite:10900
11-29 18:52:57.271: I/DynamiteModule(31298): Selected remote version of com.google.android.gms.ads.dynamite, version >= 10900
11-29 18:52:57.311: W/ResourcesManager(31298): getTopLevelResources: /data/app/com.google.android.gms-1/base.apk / 1.0 running in apps.s.r.sh rsrc of package null
11-29 18:52:57.371: W/System(31298): ClassLoader referenced unknown path: /data/data/com.google.android.gms/app_chimera/m/00000094/n/armeabi-v7a
11-29 18:52:57.371: W/System(31298): ClassLoader referenced unknown path: /data/data/com.google.android.gms/app_chimera/m/00000094/n/armeabi
11-29 18:52:57.381: W/ResourcesManager(31298): getTopLevelResources: /data/data/com.google.android.gms/app_chimera/m/00000094/AdsDynamite.apk / 1.0 running in apps.s.r.sh rsrc of package null
11-29 18:52:57.391: W/ResourcesManager(31298): getTopLevelResources: /data/data/com.google.android.gms/app_chimera/m/00000094/AdsDynamite.apk / 1.0 running in apps.s.r.sh rsrc of package null
11-29 18:52:57.391: D/DynamitePackage(31298): Instantiated singleton DynamitePackage.
11-29 18:52:57.391: D/DynamitePackage(31298): Instantiating com.google.android.gms.ads.ChimeraAdManagerCreatorImpl
11-29 18:52:57.531: I/Ads(31298): Updating ad debug logging enablement.
11-29 18:52:57.541: I/Ads(31298): Use AdRequest.Builder.addTestDevice("5165705B1A22CACD4E59EB67DC3FCE56") to get test ads on this device.
11-29 18:52:57.621: W/Ads(31298): Invoke Firebase method getInstance error.
11-29 18:52:57.621: W/Ads(31298): The Google Mobile Ads SDK will not integrate with Firebase. Admob/Firebase integration requires the latest Firebase SDK jar, but Firebase SDK is either missing or out of date
11-29 18:52:57.631: W/DynamiteModule(31298): Failed to load module via V2: java.lang.ClassNotFoundException: Didn't find class "com.google.android.gms.dynamite.DynamiteModule$DynamiteLoaderClassLoader" on path: DexPathList[[zip file "/data/app/apps.s.r.sh-1/base.apk"],nativeLibraryDirectories=[/data/app/apps.s.r.sh-1/lib/arm, /vendor/lib, /system/lib]]
11-29 18:52:57.641: I/DynamiteModule(31298): Considering local module com.google.android.gms.ads.dynamite:0 and remote module com.google.android.gms.ads.dynamite:10900
11-29 18:52:57.641: I/DynamiteModule(31298): Selected remote version of com.google.android.gms.ads.dynamite, version >= 10900
11-29 18:52:57.641: I/WebViewFactory(31298): Loading com.google.android.webview version 70.0.3538.110 (code 353811000)
11-29 18:52:57.661: W/ResourcesManager(31298): getTopLevelResources: /data/data/com.google.android.gms/app_chimera/m/00000094/AdsDynamite.apk / 1.0 running in apps.s.r.sh rsrc of package null
11-29 18:52:57.661: D/SecWifiDisplayUtil(31298): Metadata value : none
11-29 18:52:57.661: D/ViewRootImpl(31298): #1 mView = com.android.internal.policy.PhoneWindow$DecorView{4488dba I.E...... R.....ID 0,0-0,0}
11-29 18:52:57.681: W/Ads(31298): Update ad debug logging enablement as false
11-29 18:52:57.751: W/ResourcesManager(31298): getTopLevelResources: /data/app/com.google.android.webview-2/base.apk / 1.0 running in apps.s.r.sh rsrc of package null
11-29 18:52:57.761: D/ViewRootImpl(31298): MSG_RESIZED_REPORT: ci=Rect(0, 72 - 0, 0) vi=Rect(0, 72 - 0, 0) or=1
11-29 18:52:57.771: W/DisplayListCanvas(31298): DisplayListCanvas is started on unbinded RenderNode (without mOwningView)
11-29 18:52:57.791: I/Timeline(31298): Timeline: Activity_idle id: android.os.BinderProxy@e9b4ee5 time:126577403
11-29 18:52:57.901: I/art(31298): Rejecting re-init on previously-failed class java.lang.Class<hs>
11-29 18:52:57.901: I/art(31298): Rejecting re-init on previously-failed class java.lang.Class<hs>
11-29 18:52:57.921: V/ActivityThread(31298): updateVisibility : ActivityRecord{47d0972 token=android.os.BinderProxy@1308390 {apps.s.r.sh/apps.s.r.sh.First}} show : false
11-29 18:52:57.921: I/cr_LibraryLoader(31298): Time to load native libraries: ? ms (timestamps ????-????)
11-29 18:52:57.991: I/chromium(31298): [INFO:library_loader_hooks.cc(36)] Chromium logging enabled: level = 0, default verbosity = 0
11-29 18:52:57.991: I/cr_LibraryLoader(31298): Expected native library version number "70.0.3538.110", actual native library version number "70.0.3538.110"
11-29 18:52:58.821: I/Ads(31298): Ad failed to load : 3

```

The app is workimg but the ads is not showing!