Unable to Deploy Xamarin Forms App (Both Debug & Release Mode) in VS 2017 15.6.4 & VS 2015 Update 3

I was able to deploy the app successfully, but all of a sudden it stopped deploying. Build is successful but failing when trying to deploy.
I am using Visual Studio Prof 2017 15.6.4 version.
Below are the installed Xamarin Versions.
Xamarin 4.9.0.752,
Xamarin.Android Sdk 8.2.0.16

My Xamarin Forms Project is Compiling with Android 7.0 and Targeting Android 7.0 Version.

I have tried every possible attempts to solve, several restarts, clean cache, clean bin and obj folders etc., but no success.

I have updated Xamarin Tools for VS 2015 yesterday, but even after that I didn't face any issue in VS 2017. I have deployed the app today several times but it suddenly stops deploying. Earlier I was facing this issue when I compile and target with Andorid 8.0/8.1. But today Android 7.0 also not working.
I didn't do any updates in VS 2017.

Below is the Error.

8>Starting deploy Zebra Technologies TC56 ...
8>Deploying Zebra Technologies TC56 ...
8>Build started.
8>Project "QNPL.Mobile.Droid.csproj" (Install target(s)):
8>C:\Program Files (x86)\Android\android-sdk\build-tools\28.0.0-rc1\zipalign.exe 4 "D:\WorkSpace\Application\QonnectPlus\QNPL.DEV46\Mobile\QNPL.Mobile\QNPL.Mobile\QNPL.Mobile.Droid\obj\Release\android\bin\com.qonnectplus.android.apk" "bin\Release\com.qonnectplus.android-Signed.apk"
8>C:\Program Files (x86)\Android\android-sdk\build-tools\28.0.0-rc1\apksigner.BAT sign --ks "D:\Users\55421\AppData\Local\Xamarin\Mono for Android\debug.keystore" --ks-pass pass:android --ks-key-alias androiddebugkey --key-pass pass:android --min-sdk-version 16 --max-sdk-version 24 bin\Release\com.qonnectplus.android-Signed.apk
8>"apksigner.BAT" exited with code 1.
8>Done building project "QNPL.Mobile.Droid.csproj" -- FAILED.
8>Build FAILED.
8>Build started.
8>Project "QNPL.Mobile.Droid.csproj" (Install target(s)):
8>C:\Program Files (x86)\Android\android-sdk\build-tools\28.0.0-rc1\zipalign.exe 4 "D:\WorkSpace\Application\QonnectPlus\QNPL.DEV46\Mobile\QNPL.Mobile\QNPL.Mobile\QNPL.Mobile.Droid\obj\Release\android\bin\com.qonnectplus.android.apk" "bin\Release\com.qonnectplus.android-Signed.apk"
8>C:\Program Files (x86)\Android\android-sdk\build-tools\28.0.0-rc1\apksigner.BAT sign --ks "D:\Users\55421\AppData\Local\Xamarin\Mono for Android\debug.keystore" --ks-pass pass:android --ks-key-alias androiddebugkey --key-pass pass:android --min-sdk-version 16 --max-sdk-version 24 bin\Release\com.qonnectplus.android-Signed.apk
8>"apksigner.BAT" exited with code 1.
8>Done building project "QNPL.Mobile.Droid.csproj" -- FAILED.
8>Build FAILED.

I am getting the below error when I try to deploy the same project in Visual Studio 2015.

1>The package was not properly signed (NO_CERTIFICATES).
1> at Mono.AndroidTools.Internal.AdbOutputParsing.CheckInstallSuccess(String output, String packageName) in E:\A_work\16\s\External\androidtools\Mono.AndroidTools\Internal\AdbOutputParsing.cs:line 325
1> at Mono.AndroidTools.AndroidDevice.<>c__DisplayClass94_0.b__0(Task1 t) in E:\A\_work\16\s\External\androidtools\Mono.AndroidTools\AndroidDevice.cs:line 746 1> at System.Threading.Tasks.ContinuationTaskFromResultTask1.InnerInvoke()
1> at System.Threading.Tasks.Task.Execute()

Answers

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