Android Manifests merge error - unity 5 please help

CommandInvokationFailure: Unable to merge android manifests. See the Console for more details. C:/Program Files/Java/jdk-10.0.1\bin\java.exe -Xmx2048M -Dcom.android.sdkmanager.toolsdir="C:/Users/Pankaj/AppData/Local/Android/Sdk1\tools" -Dfile.encoding=UTF8 -jar "C:\Program Files\Unity\Editor\Data\PlaybackEngines\AndroidPlayer/Tools\sdktools.jar" -

stderr[

] stdout[ Warning: [Temp\StagingArea\AndroidManifest-main.xml:21, E:\Unity\NumberWizard\LaserAttack\Temp\StagingArea\android-libraries\admoblib-release\AndroidManifest.xml:3] Main manifest has but library uses targetSdkVersion='26' [Temp\StagingArea\AndroidManifest-main.xml, E:\Unity\NumberWizard\LaserAttack\Temp\StagingArea\android-libraries\support-compat-26.1.0\AndroidManifest.xml:6] Skipping identical /manifest/application/meta-data[@name=android.support.VERSION] element. [Temp\StagingArea\AndroidManifest-main.xml, E:\Unity\NumberWizard\LaserAttack\Temp\StagingArea\android-libraries\support-v4-26.1.0\AndroidManifest.xml:6] Skipping identical /manifest/application/meta-data[@name=android.support.VERSION] element. Warning: [Temp\StagingArea\AndroidManifest-main.xml:21, E:\Unity\NumberWizard\LaserAttack\Temp\StagingArea\android-libraries\unity-adapter-2.1.0.0\AndroidManifest.xml:3] Main manifest has but library uses targetSdkVersion='25' [Temp\StagingArea\AndroidManifest-main.xml, E:\Unity\NumberWizard\LaserAttack\Temp\StagingArea\android-libraries\unity-ads-sdk-2.1\AndroidManifest.xml:9] Skipping identical /manifest/application/activity[@name=com.unity3d.ads.adunit.AdUnitActivity] element. [Temp\StagingArea\AndroidManifest-main.xml, E:\Unity\NumberWizard\LaserAttack\Temp\StagingArea\android-libraries\unity-ads-sdk-2.1\AndroidManifest.xml:10] Skipping identical /manifest/application/activity[@name=com.unity3d.ads.adunit.AdUnitSoftwareActivity] element. ] exit code: 1 UnityEditor.Android.Command.Run (System.Diagnostics.ProcessStartInfo psi, UnityEditor.Android.WaitingForProcessToExit waitingForProcessToExit, System.String errorMsg) UnityEditor.Android.AndroidSDKTools.RunCommandInternal (System.String javaExe, System.String sdkToolsDir, System.String[] sdkToolCommand, Int32 memoryMB, System.String workingdir, UnityEditor.Android.WaitingForProcessToExit waitingForProcessToExit, System.String errorMsg) UnityEditor.Android.AndroidSDKTools.RunCommandSafe (System.String javaExe, System.String sdkToolsDir, System.String[] sdkToolCommand, Int32 memoryMB, System.String workingdir, UnityEditor.Android.WaitingForProcessToExit waitingForProcessToExit, System.String errorMsg) UnityEditor.HostView:OnGUI()