It sounds like you've created a team project on an SVN hosting location, and while you're able to navigate to that SVN team repository in the browser you're not able to get a local copy of it on your machine–is that accurate? If so, then please verify that you have full permissions (read, write, modify) for that location, and that the URL specified for getting the team project is the full address (with the team project name at the end):
If your SVN team repository location requires any special access then it would also be a good idea to double check that Axure RP's access to it is not being blocked by any proxies, firewalls, or other security settings. If you're on Windows, you can check proxy settings via "Account > Proxy Settings".
Hopefully that helps! If the issue is urgent then please feel free to email us at email@example.com so that we can work with you directly.