java.lang.NoClassDefFoundError: Failed resolution of: Lio/bugtags/agent/instrumentation/okhttp3/OkHt

在使用Retrofit2.0的时候碰见这个问题：

java.lang.NoClassDefFoundError: Failed resolution of: Lio/bugtags/agent/instrumentation/okhttp3/OkHttp3Instrumentation;

找了一半天最后修改了一下Gradle的版本就解决了，要注意Gradle和Gradle插件的版本要对应上

Gradle：gradle-wrapper.properties文件中的gradle;

Gradle插件：project的build.gralde中的classpath对应的gradle;

• 1、Gradle插件设置：

我项目的build.gradle,注意不是module的build.gradle

 // Top-level build file where you can add configuration options common to all sub-projects/modules.

buildscript {
    repositories {
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:2.2.1'

        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

allprojects {
    repositories {
        jcenter()
    }
}

task clean(type: Delete) {
    delete rootProject.buildDir
}

• 2、Gradle设置

#Thu Nov 16 14:49:15 CST 2017
distributionBase=GRADLE_USER_HOME
distributionPath=wrapper/dists
zipStoreBase=GRADLE_USER_HOME
zipStorePath=wrapper/dists
distributionUrl=https\://services.gradle.org/distributions/gradle-2.14.1-all.zip

我之前使用的Gradle版本是3.3修改为2.14.1后就可以了，原因我还不知道，有路过的大神请给答案，谢了。