移动推送sdk报错

怎么解决呢

backtrace:
java.lang.NullPointerException: Attempt to invoke interface method 'void com.alibaba.sdk.android.push.CommonCallback.onSuccess(java.lang.String)' on a null object reference
at com.alibaba.sdk.android.push.impl.c.onSuccess(Unknown Source)
at com.alibaba.sdk.android.push.impl.a.a(Unknown Source)
at com.alibaba.sdk.android.push.impl.a$a.a(Unknown Source)
at com.alibaba.sdk.android.push.impl.a$a.onPostExecute(Unknown Source)
at android.os.AsyncTask.finish(AsyncTask.java:679)
at android.os.AsyncTask.access$500(AsyncTask.java:180)
at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:696)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:150)
at android.app.ActivityThread.main(ActivityThread.java:5546)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:794)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:684)