Xcode 6.4中的iOS模拟器显示多个版本，名称中有很长的“id”

I have Xcode 6.4 installed and I also have Xcode 7 beta installed. Recently I launched Xcode 6 and I showed multiple versions of the iOS simulators and they had long id/like uuid looking ids in the names. Some of them do not work. Has anyone seen this and does anyone have an idea of how to fix it. I have deleted beta. I have deleted and reinstalled Xcode 6 multiple times. I have uninstalled Xcode 6 using an app like app cleaner as well. I also have went and deleted via terminal the simulator at "/Library/Developer/CoreSimulator/Profiles/Runtimes ". I tried sudo /Developer/Library/uninstall-devtools --mode=all but I get command not found.I have Xcode 6.4 installed and I also have Xcod