Gradle failed to fetch dependencies | Resolution failed -in Unity3d - unity3d

Question

This error occurs when I try to build&Run my game with Unity. I've also imported the GooglePlayServices/ads from here and also have the latest android sdk and jdk-8u144.
Here is the Error Log:
Gradle failed to fetch dependencies
Failed to run 'Temp\PlayServicesResolverGradle\gradlew.bat -b Temp\PlayServicesResolverGradle\PlayServicesResolver.scripts.download_artifacts. gradle --no-daemon "-PANDROID_HOME=C:/Users/rfkha/AppData/Local/Android/sdk1" "- PTARGET_DIR=C:\Users\rfkha\Documents\Space Shooter\Assets\Plugins\Android" "- PMAVEN_REPOS=https://maven.google.com" "- PPACKAGES_TO_COPY=com.google.android.gms:play-services-ads:11.2.2"'
stdout:
ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
Please set the JAVA_HOME variable in your environment to match the
location of your Java installation.
stderr:
exit code: 1
UnityEngine.Debug:LogError(Object)
GooglePlayServices.PlayServicesResolver:LogDelegate(String, LogLevel)
Google.JarResolver.PlayServicesSupport:Log(String, LogLevel, Boolean)
GooglePlayServices.<GradleResolution>c__AnonStorey14:<>m__20(Result)
GooglePlayServices.<GradleResolution>c__AnonStorey15:<>m__29()
GooglePlayServices.PlayServicesResolver:PumpUpdateQueue()
UnityEditor.EditorApplication:Internal_CallUpdateFunctions()
2nd Error:
Resolution failed
Failed to fetch the following dependencies:
com.google.android.gms:play-services-ads:11.2.2
UnityEngine.Debug:LogError(Object)
GooglePlayServices.PlayServicesResolver:LogDelegate(String, LogLevel)
Google.JarResolver.PlayServicesSupport:Log(String, LogLevel, Boolean)
GooglePlayServices.ResolverVer1_1:LogMissingDependenciesError(List`1)
GooglePlayServices.<DoResolutionUnsafe>c__AnonStorey17:<>m__26(List`1)
GooglePlayServices.<GradleResolution>c__AnonStorey14:<>m__20(Result)
GooglePlayServices.<GradleResolution>c__AnonStorey15:<>m__29()
GooglePlayServices.PlayServicesResolver:PumpUpdateQueue()
UnityEditor.EditorApplication:Internal_CallUpdateFunctions()

Answer 1

add JAVA_HOME to your environment variables for mine it is C:\Program Files\Java\jdk1.8.0_144 It worked for me maybe it will for you.

Answer 2

For me latest Google Play Services resolver cannot copy library play-services-ads.aar to /Assets/Plugins/Android. I have to copy it manually from sdk folder:
sdk\extras\google\m2repository\com\google\android\gms\play-services-ads
to my
/Assets/Plugins/Android folder.

Answer 3

Delete all Google AdS files from the Asset Name folder and re-import the Google AdS package.
Or
-Right click on "my computer" and go to properties.
-Go to the Advanced tab
-Click on the Environmental Variables button
-Find the JAVA_HOME variable under System Variables
-Change the value to wherever this file actually exists for you. (for me it was C:\Program Files\Java\jdk-10)
-Restart Unity

Answer 4

I had to add the Jdk address as given in unity->Edit->preferences
and paste the address in the JAVA_HOME variable value.
then I restart my system and it fetched all the android dependencies and started working.
if it does not start fetching on its own you can force resolve the android dependencies.Assets->ExternalDependencyManager->AndroidResolver->force Resolve.