我正在使用Rtofit在实施改造后处理来自Mobile的Serverside数据我得到以下例外任何关于这个问题的知道告诉我我做错了

Init Retrofit：

mRetrofit = new Retrofit.Builder()
                    .baseUrl(AppConstance.APP_URL)
                    .addConverterFactory(GsonConverterFactory.create())
                    .build();
            Iservice = mRetrofit.create(IdeaService.class);

Gradle文件

dependencies {
    compile fileTree(dir: 'libs',include: ['*.jar'])
    testCompile 'junit:junit:4.12'
    compile 'com.android.support:appcompat-v7:23.2.1'
    compile 'com.squareup.retrofit2:retrofit:2.0.2'
    compile 'com.squareup.retrofit2:converter-gson:2.0.0'
    compile 'com.squareup.okhttp:okhttp:2.2.0'
    compile 'com.squareup.okhttp:okhttp-urlconnection:2.0.0'
    compile 'com.squareup.okio:okio:1.7.0'
}

堆栈跟踪

   04-26 11:54:36.441 18355-18355/com.omt.example W/dalvikvm: threadid=1: thread exiting with uncaught exception (group=0x41da0c98)
04-26 11:54:36.441 18355-18355/com.omt.example W/dalvikvm: threadid=1: uncaught exception occurred
04-26 11:54:36.442 18355-18355/com.omt.example W/System.err: java.lang.NoClassDefFoundError: retrofit2.Platform
04-26 11:54:36.444 18355-18355/com.omt.example W/System.err:     at retrofit2.Retrofit$Builder.