difficult question

Hey,
I am searching for a answer to create a vcs root with the rest api.

I have tried many thing but I can't get the solution of that problem.
The Rest Api page only telling me this:
Create a new VCS root: POST VCS rot XML (the one like retrieved for a GET request for VCS root details) to http://teamcity:8111/httpAuth/app/rest/vcs-roots

but when I send this Request the Server giving me an error 400 that called when the element not the right one.

PLEASE HELP ME :_|

Marcus Priwall

PS: the Server version is 8.1