smack 4.1.1 accountManager createAccont gets 400 error?

Hi all,

     I'm newbie of samck,and try to use smack 4.1.1 in my android project,I've did a little bit test about login exist user and sending message,everything seems ok.

but when i tried to use accountManager to create a new account,the createAccount func thrown an error: "bad-request-modify" if no existed user login at the first place.

I don't know if i did something wrong.Can anyone help? thanks any way.

code likes this:

     .....

     XMPPTCPConnectionConfiguration config .....//

     .......

     mConnection = new XMPPTCPConnection(config);

     mConnection.connect();//mConnect.isConnected == true

     //mConnection.login("test1", "111111");  //test1 is exist,createAccount goes fine if uncomment this line otherwise createAccount  throws "bad-request-modify"

     AccountManager accountManager= AccountManager.getInstance(mConnection);
     accountManager.sensitiveOperationOverInsecureConnection(true);
     accountManager.createAccount("test2", "111111",mp);