I get this message when i start Service Studio 10. i'll also installed Platform version 10. Where can I select the right Platform ?
seems that you've installed the latest Service Studio but you're trying to connect to an environment that is not upgraded. If you're going to upgrade the server, you'll be fine. If the server is not being upgraded in the short term, you'll need to install Service Studio 9.1.xx to be able to work in there.
Download the compatible development version from here.