Getting error while build the application

Hello,
I have downloaded the sample application JitsiSDKTest from the link https://github.com/jitsi/jitsi-meet-sdk-samples/tree/master/android/java/JitsiSDKTest. But I am not able to build the application.
Iam getting errors

  • ERROR: Unable to resolve dependency for ‘:app@debugAndroidTest/compileClasspath’: Could not download android-jsc-r245459.aar (org.webkit:android-jsc:r245459)
  • ERROR: Unable to resolve dependency for ‘:app@debug/compileClasspath’: Could not download react-native-0.61.3.aar (com.facebook.react:react-native:0.61.3)
  • ERROR: Unable to resolve dependency for ‘:app@debug/compileClasspath’: Could not download android-jsc-r245459.aar (org.webkit:android-jsc:r245459)
  • ERROR: Unable to resolve dependency for ‘:app@debugAndroidTest/compileClasspath’: Could not download react-native-0.61.3.aar (com.facebook.react:react-native:0.61.3)
  • ERROR: Unable to resolve dependency for ‘:app@debugAndroidTest/compileClasspath’: Could not download react-native-webrtc-1.75.3-jitsi-3272073.aar (com.facebook.react:react-native-webrtc:1.75.3-jitsi-3272073)
  • ERROR: Unable to resolve dependency for ‘:app@debugUnitTest/compileClasspath’: Could not download react-native-webrtc-1.75.3-jitsi-3272073.aar (com.facebook.react:react-native-webrtc:1.75.3-jitsi-3272073)
  • ERROR: Unable to resolve dependency for ‘:app@debugUnitTest/compileClasspath’: Could not download react-native-0.61.3.aar (com.facebook.react:react-native:0.61.3)
  • ERROR: Unable to resolve dependency for ‘:app@debug/compileClasspath’: Could not download react-native-webrtc-1.75.3-jitsi-3272073.aar (com.facebook.react:react-native-webrtc:1.75.3-jitsi-3272073)
  • ERROR: Unable to resolve dependency for ‘:app@debugUnitTest/compileClasspath’: Could not download android-jsc-r245459.aar (org.webkit:android-jsc:r245459)

I am using Android Studio 3.6.3 and change the gradle to latest .

Can you please help?