can't pass the grade build

[KuroGeo]

Environment
JDK 8

Execution failed for task ':app:checkDebugDuplicateClasses'.
> A failure occurred while executing com.android.build.gradle.internal.tasks.CheckDuplicatesRunnable
   > Duplicate class android.support.v4.app.INotificationSideChannel found in modules core-1.6.0-runtime (androidx.core:core:1.6.0) and support-compat-27.1.1-runtime (com.android.support:support-compat:27.1.1)
     Duplicate class android.support.v4.app.INotificationSideChannel$Stub found in modules core-1.6.0-runtime (androidx.core:core:1.6.0) and support-compat-27.1.1-runtime (com.android.support:support-compat:27.1.1)
     Duplicate class android.support.v4.app.INotificationSideChannel$Stub$Proxy found in modules core-1.6.0-runtime (androidx.core:core:1.6.0) and support-compat-27.1.1-runtime (com.android.support:support-compat:27.1.1)
     Duplicate class android.support.v4.os.IResultReceiver found in modules core-1.6.0-runtime (androidx.core:core:1.6.0) and support-compat-27.1.1-runtime (com.android.support:support-compat:27.1.1)
     Duplicate class android.support.v4.os.IResultReceiver$Stub found in modules core-1.6.0-runtime (androidx.core:core:1.6.0) and support-compat-27.1.1-runtime (com.android.support:support-compat:27.1.1)
     Duplicate class android.support.v4.os.IResultReceiver$Stub$Proxy found in modules core-1.6.0-runtime (androidx.core:core:1.6.0) and support-compat-27.1.1-runtime (com.android.support:support-compat:27.1.1)
     Duplicate class android.support.v4.os.ResultReceiver found in modules core-1.6.0-runtime (androidx.core:core:1.6.0) and support-compat-27.1.1-runtime (com.android.support:support-compat:27.1.1)
     Duplicate class android.support.v4.os.ResultReceiver$1 found in modules core-1.6.0-runtime (androidx.core:core:1.6.0) and support-compat-27.1.1-runtime (com.android.support:support-compat:27.1.1)
     Duplicate class android.support.v4.os.ResultReceiver$MyResultReceiver found in modules core-1.6.0-runtime (androidx.core:core:1.6.0) and support-compat-27.1.1-runtime (com.android.support:support-compat:27.1.1)
     Duplicate class android.support.v4.os.ResultReceiver$MyRunnable found in modules core-1.6.0-runtime (androidx.core:core:1.6.0) and support-compat-27.1.1-runtime (com.android.support:support-compat:27.1.1)