I am trying to build the gradle file for android_core ROS-Kinetic version. However, I think there is a problem while the script tries to download the .pom file. Please tell me how to resolve this problem. Thank you.

Commandline Output:
PS C:\Users\User\Downloads\android_core-kinetic\src\android_core> .\gradlew.bat

FAILURE: Build failed with an exception.

• What went wrong:
  A problem occurred configuring root project 'android_core'.

Could not resolve all artifacts for configuration ':classpath'.
Could not resolve com.android.tools.build:gradle:3.5.2.
Required by:
project :
> Could not resolve com.android.tools.build:gradle:3.5.2.
> Could not get resource 'https://dl.google.com/dl/android/maven2/com/android/tools/build/gradle/3.5.2/gradle-3.5.2.pom'.
> Could not HEAD 'https://dl.google.com/dl/android/maven2/com/android/tools/build/gradle/3.5.2/gradle-3.5.2.pom'.
> sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target

• Try:
  Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

• Get more help at https://help.gradle.org

BUILD FAILED in 4s