Gradle同步失败，因为"Unable to load Maven meta-data from ..."，但我可以通过浏览器下载该文件

Question

buildscript {

repositories {

    google()

    jcenter()
    jcenter{ url"http://jcenter.bintray.com"}
    maven {
        url 'http://dl.bintray.com/amulyakhare/maven'
    }

}
dependencies {
    classpath "com.android.tools.build:gradle:$android_plugin_version"
    classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
    classpath "org.jetbrains.kotlin:kotlin-android-extensions:$kotlin_version"
    classpath "com.mob.sdk:MobSDK:+"
    // NOTE: Do not place your application dependencies here; they belong
    // in the individual module build.gradle files
}


allprojects {
repositories {

    google()

    jcenter()
    jcenter{ url"http://jcenter.bintray.com"}

    maven {
        url 'http://dl.bintray.com/amulyakhare/maven'
    }

}

}

这是我的gradle文件。执行gradle同步时，出现错误。

Caused by: org.gradle.internal.resolve.ModuleVersionResolveException: Could not resolve com.mob.sdk:MobSDK:+.
Caused by: org.gradle.api.resources.ResourceException: Unable to load Maven meta-data from http://jcenter.bintray.com/com/mob/sdk/MobSDK/maven-metadata.xml.

Caused by: org.gradle.api.resources.ResourceException: Could not get resource 'http://jcenter.bintray.com/com/mob/sdk/MobSDK/maven-metadata.xml'.
Caused by: org.gradle.internal.resource.transport.http.HttpRequestException: Could not GET 'http://jcenter.bintray.com/com/mob/sdk/MobSDK/maven-metadata.xml'.

但是我可以通过浏览器直接下载url http://jcenter.bintray.com/com/mob/sdk/MobSDK/maven-metadata.xml。有人知道为什么会这样吗？

Answer 1

buildscript {
   repositories {
      maven {url 'http://maven.aliyun.com/nexus/content/groups/public/'}
    }
 }
  ...............
  ...............
allprojects{
   repositories {
      maven {url 'http://maven.aliyun.com/nexus/content/groups/public/'}
    }
}