HttpRequestException：Android Studio 3.1.1 中无法发出警告（但同步成功）

Hi I facing a problem while syncing the project. I am getting warning after sync successfully

I don't know why I am getting this warning. If click on warning in build window than get this message

图像中的消息是

org.gradle.internal.resource.transport.http.HttpRequestException: Could not HEAD 'https://jcenter.bintray.com/com/android/tools/build/gradle/3.1.2/gradle-3.1.2.pom'.

造成原因：

javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target

如果点击url

https://jcenter.bintray.com/com/android/tools/build/gradle/3.1.2/gradle-3.1.2.pom https://jcenter.bintray.com/com/android/tools/build/gradle/3.1.2/gradle-3.1.2.pom比收到此消息 -

{
  "errors" : [ {
    "status" : 404,
    "message" : "Could not find resource"
  } ]
}

我在用

 classpath 'com.android.tools.build:gradle:3.1.2'
 classpath 'com.google.gms:google-services:3.3.0'

and

 implementation "com.android.support:appcompat-v7:${support_version}"
    implementation "com.android.support:design:${support_version}"
    implementation "com.google.firebase:firebase-core:${play_version}"
    implementation "com.google.firebase:firebase-config:${play_version}"
    implementation "com.google.firebase:firebase-messaging:${play_version}"
    implementation "com.google.android.gms:play-services-tagmanager:${play_version}"
    implementation "com.google.android.gms:play-services-auth:${play_version_old}"
    implementation "com.google.android.gms:play-services-maps:${play_version_old}"
    implementation "com.google.android.gms:play-services-location:${play_version_old}"

buildscript{

    ext{
        play_version = '15.0.2'
        play_version_old = '15.0.0'
        support_version = '27.1.1'
    }
}

我解决了这个问题 文件 -> 设置 -> 工具 -> 服务器证书 -> 自动接受不可信证书