android sdk 运行时报java.lang.NoClassDefFoundError: okhttp3.OkHttpClient$Builder错误

错误日志 ：java.lang.NoClassDefFoundError: okhttp3.OkHttpClient$Builder
at com.alibaba.sdk.android.oss.internal.InternalRequestOperation.(InternalRequestOperation.java:82)
at com.alibaba.sdk.android.oss.OSSClient.(OSSClient.java:99)
at com.tan.uploadtooss.MainApplication.initOSSConfig(MainApplication.java:49)
at com.tan.uploadtooss.MainApplication.onCreate(MainApplication.java:35)
at android.app.Instrumentation.callApplicationOnCreate(Instrumentation.java:999)
at android.app.ActivityThread.handleBindApplication(ActivityThread.java:4151)
at android.app.ActivityThread.access$1300(ActivityThread.java:130)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1255)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4745)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
at dalvik.system.NativeStart.main(Native Method)

具体错误代码定位在
OSS oss = new OSSClient(getApplicationContext(), MainApplication.OSS_BUCKET_HOST_ID, credentialProvider, conf); 这句话上

问题是我已经依赖了aliyun-oss-sdk-android-2.2.0.jar ，okhttp-3.2.0.jar ，okio-1.6.0.jar Android sdk 中的这三个jar包 在编译的时候没问题 但是一运行就报这个错误

已经被这个问题困扰好几天了请大神帮帮解答