I also got this error several times while debugging. (Administrator permissions required...) I thought it had something to do with the permissions and just ignored it. It has surely something to do with what Carlos stated It happened again, but now I think I know what's going on.. At start It works fine, but after some time the user's session timeouts and I get this error message from Service Studio. If I login again in the espace and try debugging it works again. I'm using ServiceStudio 5.1.1.3