When I use API to create a user, I get an error!

The command is:

    #curl -d '{"username":"test","password":"test","email":"123@123.com"}' http://myip:8080/api/users?key=my_key

I get some information:

   

 

 

And I find the api controller source code of users in my galaxy instance, it's different with the source in api document.

 

This is mine:

 

And this is the document:

 

I don't understand how it happens.Please tell me how to fix it.Thank you!

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